How does steel differ from pig iron?
A: Less carbon
B: More carbon
C: Steel is preferred by sheep and chooks
D: None of the above
A: Less carbon
B: More carbon
C: Steel is preferred by sheep and chooks
D: None of the above
A
举一反三
- If the carbon content of a type of steel is 0.1%， this steel is a kind of （ ）. A: low-carbon steel B: medium-carbon steel C: high-carbon steel D: HTLA steel
- If the carbon content of a type of steel is 0.1%, this steel is a kind of (). A: low-carbon steel B: medium-carbon steel C: high-carbon steel D: HTLA steel E: 2-1-1 F: 章测
- Steel is not as _____ as cast iron; it does not break as easily.
- Iron and steel are flexible. But they are not as flexible ______ rubber. A) as C) to B) for D) by A: Iron and steel are flexible. But they are not as flexible ______ rubber. B: as C: for D: to E: by
- The main social services of the iron and steel industry system are the provision of iron and steel products and the consumption of iron ore A: 正确 B: 错误
内容
- 0
Of the more common elements(元素) are hydrogen, oxygen, carbon, iron, copper, etc.
- 1
To improve the machinability of low carbon steel, the heat treatment process usually used is ( ) . A: quenching B: tempering C: annealing D: normalizing
- 2
Why is more earth's heat blocked from escaping with more carbon dioxide in the atmosphere A: Carbon dioxide prevents the sun's energy from going back into space. B: Carbon dioxide radiates the sun's energy onto the earth. C: Carbon dioxide produces more heat in the atmosphere. D: Carbon dioxide takes in the sun's energy at infra-red wavelengths.
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Which is more brittle, glass or steel? A: glass B: steel
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How does skimming differ from survey?