题目内容

A sweep oar is an oar that is（）.

A. generally shorter than the others and is used to steer with
B. is longer than the others and is used as the stroke oar
C. is raised in the bow of the boat for the steersman to steer by
D. longer than the others used for steering

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差异交往理论

液力耦合器的输出力矩随涡轮转速的增大而（）。

A. 增大
B. 降低
C. 不变
D. 无法确定

钢丝绳怎么选择？

汽车发动机尾气中的氮氧化合物，碳烟和微粒等污染了环境。

A. 正确
B. 错误