题目内容

钢中合金元素越多，淬火后钢的硬度越高。

A. 对
B. 错

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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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Cr12钢是典型的冷作模具钢。

A. 对
B. 错

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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

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Rather than spread control among hundreds oreven thousands of local, regional, and nationalagencies that watch various aspects of water use,countries should set up central authorities tocoordinate water policy.In order to raise the efficiency of the water supply,measures should be taken to _______.

A. centralize the management of water resources
B. increase the sense of responsibility of agencies at all levels
C. guarantee full protection of the environment
D. encourage local and regional control of water resources

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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。

Cr12钢是典型的冷作模具钢。

Rather than spread control among hundreds oreven thousands of local, regional, and nationalagencies that watch various aspects of water use,countries should set up central authorities tocoordinate water policy.In order to raise the efficiency of the water supply,measures should be taken to _______.

A. 对
B. 错