What's the meaning of JL (2) 91 (3) a in the water and electricity diagram

It refers to a point number. See more answers > >

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1. Meanings of symbols of JL / gia-500 / 45-48 / 7 conductor
2. What does exp JL 2015 mean The outer package of baby vitamin D says,
3. In a circle, see a capital P, a line down the mark in English
4. The ratio of cement, sand and stone is 2:3:5. How many tons of cement, sand and stone are needed to mix 20 tons of such concrete?
5. The ratio of cement, sand and stone is 2:3:5. How many tons of cement, sand and stone are needed to mix 20 tons of such concrete?
6. How many tons of cement, sand and stone do builders need to prepare 190 tons of concrete with 2:3:5 ratio of cement, sand and stone? emergency
7. A kind of concrete is made of cement sand and gravel in the ratio of 2:3:5. At present, 700 kg of cement, 800 kg of sand and 600 kg of gravel can be mixed at most A few kilos of earth
8. The ratio of concrete, cement, sand and stone is 2:3:5, in which 3 tons of cement is used, and how many tons of sand and stone are used respectively?
9. Concrete is made of cement, sand and stone by mixing 2:3:5, the existing cement 6 tons, how many tons of sand and stone each
10. The bottom area of a cuboid is 56 square centimeters and its height is 8 centimeters. Find its volume
11. How many ohms of 110kV grounding electrode resistance is stipulated by the state
12. Four fifths of the length of the steel bar is sawed into small sections of the same length for 6 times, each section is () m long. If it takes 2 minutes to sawn into two sections, it takes 2 minutes to sawn into six sections () minutes Why?
13. A steel bar is sawed off 20% and then connected for 2 meters. At this time, the steel bar is 110 shorter than the original one. How long is the original steel bar?
14. Saw the 5m long steel bar into small sections of the same length for 6 times, how long is each section? For example, saw each section for 2 minutes, saw 6 sections for several minutes?
15. Weld circles with 7-meter-long steel bars, each of which has a diameter of 2 decimeters. How many such circles can this steel bar weld? (excluding Street)
16. What is the weight per meter of steel bars with diameters of 8, 10, 12, 14 and 16 mm? Am I wrong? 0.008m × 0.008m × 3.1416 × 1m × 7850kg / m ^ 3 = 0.395kg/m So light? I didn't look at physics for several years, but I forgot all about it be ashamed
17. The diameter of steel bar is 32 mm. What is the weight per meter
18. Abbreviations of the people's Republic of China, the United States, CCTV and the foundation
19. United Nations, people's Republic of China
20. What is the unit in this formula? The weight of aluminum plate (kg) = 0.00171 × thickness × width × length