曲线缩短轨长度有比12.5m标准轨短()、()、()mm的三种。
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I bought two ______ yesterday.
A. watchs
B. watches
C. watch
D. watchings
曲线缩短轨长度有比25m标准轨短(40)、(80)、(160)mm的三种。
当新轨组布置在道心时,靠近外股的新轨组间应有空头,靠近里股的新轨组间应有搭头。
A. 对
B. 错
On the first Monday in September is Labor Day. Obviously it is a day of recognition of workers.
A. 对
B. 错