According to the main uses, what are the main types of steel? What is black metal? What are non-ferrous metals? What are the commonly used nonferrous metals? What are the advantages of materials? What should I pay attention to when using a file? Why do the saws of hacksaw blades stagger from side to side? What kinds of hand pliers are commonly used? Wait, today we will give you several basic knowledge test questions about gas, so that you can judge for yourself how much you know about cherry blossom gas water heaters. Details are as follows.

1. The main components of natural gas are: A carbon monoxide, hydrogen B methane and ethane.

2. The main components of artificial gas are: A carbon monoxide, hydrogen B methane and ethane.

3. The main components of liquefied petroleum gas are: a propane, methane, propylene, butene, c carbon monoxide, hydrogen and hydrocarbons.

The biggest advantage of natural gas is that A can supply gas in bottles, and B has the best environmental protection effect.

5. The biggest disadvantage of artificial gas is that A has a fast combustion speed and B has a stable flame.

6. Compared with air, the relative density of liquefied petroleum gas is as high as air A and air C..

7. Compared with water, the relative density of liquefied petroleum gas is as high as water, and so is C.

8. Which of the following signs belongs to man-made gas: a6t b 6r?

9. Which of the three fuels has the highest calorific value: A artificial gas and B natural gas.

10, when gas and air are mixed, which ratio is better, with more gas A and less gas B.

1 1. If the concentration of combustible gas is outside the explosion limit, then: A will not explode and B may explode.

12, which of the following is not a part of the injection burner: mixing part B damper.