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List of contents for this article:

• 1、What does the number 1 - 7 mark on a triangle on a plastic product mean?
• 2、Midea's water storage electric water heater recommended
• 3、What is the fluorescence of the 1980 pentagon note?
• 4、What are the letters in a strong electricity and what do they mean?
• 5、Which crown names in China's fifth set of RMB have relatively small circulation?
• 6、What material is good for lenses

What does the number 1 - 7 mark on a triangle on a plastic product mean?

1. There is a triangle on the plastic with numbers 1 - 7 in it. Different numbers represent different materials. The number "1" represents polyethylene terephthalate, or PET. Purpose: Mainly used for mineral water bottles, carbonated acid, juice beverage bottles, soy sauce and vinegar bottles, etc. The number "2" represents high-density polyethylene, or HDPE. Purpose: HDPE and other plastics are made into composite films, and are also used in aquatic products.

2. There are numbers 1 to 7 inside the triangle, and each number represents a plastic container.

3. The numbers 1 to 7 in the triangle on plastic products represent different plastic types and uses: -No. 1 represents PET, or polyethylene terephthalate, which is usually used to make mineral water bottles and carbonated beverage bottles. - No. 2 stands for HDPE, or high-density polyethylene, which is commonly used in the packaging of cleaning products and bathing products, as well as some plastic bottles. - No. 3 stands for PVC, or polyvinyl chloride, which is commonly found in raincoats, building materials, plastic films and some food packaging.

Midea's water storage electric water heater recommended

Among Midea storage-type electric water heaters, if you pursue a balance between safety and power saving, it is recommended to give priority to Midea F80 - 32Q5SPRO (outstanding safety), Midea F80 - 33JE6Pro (HE)(outstanding power saving) or Midea F6033-UD7 Pro (taking into account both).

The following are Midea water storage electric water heaters recommended according to different needs: Pursuing water purification and intelligent control: Midea F60 - 33XQ5 This model focuses on the concept of living water, adopts a living water core design, is equipped with a visual filter cup, and integrates nano-level net filtration, silver ion antibacterial, pasteurized high temperature sterilization and third-generation chlorine removal technology (chlorine removal rate ≥ 98%), outstanding water purification capabilities.

Midea and Haier storage-type electric water heaters have their own advantages, and the specific selection requires comprehensive decisions based on the number of households, water quality conditions and usage scenarios.

Recommendation for water-storage electric water heaters in 024: Haier: PD3 series: High cost performance, suitable for small families, providing a 50L/60L capacity choice, with a 5-fold capacity expansion function. PD7 series: adopts double tube design, 7 times capacity expansion, zirconium gold all-ceramic liner, high heating efficiency. EC6005 JE7 KU1: It has water purification and filtration function, 9 times capacity increase, electric-proof wall technology, and ensures safety.

What is the fluorescence of the 1980 pentagon note?

The fluorescent varieties of the 0-version pentagon banknotes are mainly divided into 7 categories, with different categories having different fluorescent performances, existing quantities and crown ranges.

There are 12 mainstream fluorescent versions of Wujiao banknotes in 2000 under ultraviolet light, and the characteristics of each version are significantly different. China red fluorescence: The most common fluorescent version. Only the middle area of the bill has fluorescence, and there is no fluorescence reaction on both sides. Full red fluorescence: It belongs to full-scale fluorescence, and the entire banknote will show a uniform fluorescence effect. Sun red fluorescence: Only the front side of the bill has a fluorescent effect, and there is no obvious fluorescent reaction on the back.

There are multiple fluorescent versions of the 2000-year-old Wujiao banknotes. China red fluorescence This fluorescence presents a bright red fluorescence effect under violet light. Its front patterns, words, etc. are clearly visible under fluorescent light, and the overall visual effect is more prominent. For example, the national emblem on the front, the words "People's Bank of China", etc. will be displayed in obvious red under the fluorescent light, giving people a unique viewing experience.

There are multiple fluorescent versions of the 2000-year-old Wujiao banknotes. China red fluorescence characteristics: Under fluorescent lights, the front side of the banknotes presents a bright red fluorescence effect. The red part of the entire ticket face, such as the national emblem, characters, etc., will emit strong red fluorescence, which is very eye-catching. Distribution: This fluorescent version is more common in some crown banknotes. For example, some early issued crowns can clearly see the characteristics of China's red fluorescence under fluorescent lights.

What are the letters in a strong electricity and what do they mean?

1. Common letters and letter combinations in strong current system diagrams are:Differences between pc1 and yj2: SC70 means pipe diameter is 70 mmDifferences between pc1 and yj2steel pipeDifferences between pc1 and yj2, TC stands for BridgeDifferences between pc1 and yj2, BV4 denotes copper core wire with a cross-section of 4 mm, PC (PVC) 25 denotes PVC flame-retardant wire pipe with a diameter of 25 mm, FC denotes laying in the floor, WC denotes laying in the wall, and CC denotes laying in the roof.

2. Letters related to strong electricity: AC (Alternating Current) refers to alternating current. Typical scenarios are domestic electricity (220 V AC) or high-voltage transmission systems. DC (Direct Current) refers to direct current, which is mostly used in industrial equipment, such as large DC motors and rail transit power supply systems. kV (kilovolt) voltage is unit of "kilovolt" and is commonly found on high-voltage transmission lines (such as 220 kV overhead lines).

3. The wiring wire number standard mainly includes wire number marking rules for strong and weak current: wire number marking rules for strong current: single-phase three-wire power system connected to AC220V: wire numbers adopt the three letters "L, N, and G" respectively, and are composed of four digits. It is mainly used for connecting upper and lower connections of air switches, AC 220V input of switching power supplies, or related wiring of strong current equipment such as UPS and filters.

4. In strong electricity construction drawings, symbols with different label numbers and letter combinations representDifferences between pc1 and yj2Different power distribution equipment. For example, ZAP stands for intelligent power distribution box, ZAL stands for intelligent lighting distribution box, ALE stands for emergency lighting distribution box, and ZAT refers to dual power switching box. Among them, the AW symbol identifies the meter box, which is used to measure and monitor power usage.

Which crown names in China's fifth set of RMB have relatively small circulation?

The rare crowns of 1 yuan a year mainly include the first crown, the supplementary crown, the special rare crown, the big leaf orchid crown, the digital crown, etc. Initial crown: FA is the first crown number of the fifth set of RMB 1-yuan banknotes. It has the meaning of "opening the door", has special significance for issuance, and has significant collection value. The price at the beginning of issuance has doubled. Supplement number crown: Used to replace defective printing products, with a small stock.

The crown number "OH" belongs to the rare crown number category and has high collection and investment value. Crown Number Ownership and Issue Background In the second crown number system of the fifth set of RMB 99 version of 1-yuan banknotes (referred to as "991"), the crown number "OH" is clearly listed as one of the rare crown numbers. A total of 615 crowns were released in the 991 Second Crown (616 including AA crowns), of which "OH" has become a key variety in the collection market due to its small circulation.

The h6n09 running water section in the one-dollar note belongs to white silk fiber cloud paper. The 991 Tri-Crown is the least issued crown number of 991. In this crown number, the central bank conducted a large number of fluorescence and anti-counterfeiting experiments on paper banknotes. Specifically: Experimental content: In the H*N crown, the central bank conducted the fifth set of RMB fiber cloud banknote experiments. This kind of fiber cloud paper bill is essentially different from the fiber cloud anti-counterfeiting silk in the third and fourth sets of RMB.

One-yuan banknotes are the one-yuan banknotes in the fifth set of RMB. There are different series of crown numbers such as two-crown, three-crown, four-crown, and five-crown. Second Crown's 991 one-yuan issue was earlier, and relatively less will exist in the world. Its paper quality is better and the ink color is brighter. The three crown 991 yuan has certain improvements in the printing process, and the overall pattern is clear. The 991 yuan of Siguan is further optimized in terms of anti-counterfeiting features and other aspects.

What material is good for lenses

1. The following are good choices. Glass material: Glass lenses have excellent optical properties and can provide very clear visual effects. It has excellent wear resistance, is not easy to be scratched, and can maintain good use for a long time. Moreover, glass lenses can effectively block ultraviolet and infrared rays. However, glass lenses are heavy, may feel oppressive and relatively fragile when worn for a long time.

2. There is no absolute best eyeglass lens material. You need to choose the appropriate category of resin lenses based on eye needs, degrees, budget and usage scenarios (current mainstream choice). This is the most commonly used lens material on the market. Most of the mainstream ordinary models are CR-39 material, which weighs only about half of that of glass lenses. It has good impact resistance and is not easy to crack. It can also be easily added with anti-blue light, anti-ultraviolet, anti-fog and other coatings.

3. Resin lenses are currently the most mainstream lens material on the market. Advantages: light weight, more comfortable to wear, strong impact resistance and not easy to break, high safety, can be easily dyed and customized, and is suitable for multiple frame styles. Disadvantages: Poor wear resistance and easy to be scratched. Additional anti-scratch coating is needed. The light transmittance is slightly lower than that of glass lenses.

4. When choosing lens materials with glasses, you can choose them according to your eye needs, budget and usage scenarios. The following is a detailed comparison of different materials: Advantages of glass lenses: High refractive index, thinner lens under the same degree, wear resistance Strong, excellent light transmittance, clear and stable vision, and relatively cheap price.

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