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问题 单项选择题

线路允许速度vmax≤120km/h正线及到发线，60kg/m钢轨头部垂直磨耗量超过（）时为轻伤钢轨。

A、8mm

B、9mm

C、10mm

D、11mm

答案

参考答案：B

选择题

China rank ______ in the 2008 Beijing Olympic Games and more and more countries _______

China as a friendly and powerful country.    [ ]

A. the first; rank    

B. first; rank  

C. the first; regard  

D. first; suppose

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选择题

China stands ready to join hands with all other countries to _________ the serious problems resulting from the energy crisis and build an even better future for the generations to come.

A．tend to

B．cut off

C．hold back

D．deal with
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