题目内容

高速工具钢在热轧或热锻后空冷，就能获得马氏体组织。

A. 对
B. 错

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钢中合金元素越多，淬火后钢的硬度越高。

A. 对
B. 错

钢的耐蚀性要求愈高，碳的质量分数应愈高。

A. 对
B. 错

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A. 对
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Robert Foss, a scientist at the University of NorthCarolina Highway Safety Research Center, saysthe higher death rates for teenage drivers have lessto do with “really stupid behavior” than with justa lack of driving experience.According to Robert Foss, the high death rate ofteenage drivers is mainly due to ________

A. their frequent driving at night
B. their driving with passengers
C. their improper way of driving
D. their lack of driving experience