差速器的功用是当叉车转弯或在凹凸不平的道路上行驶时,能自动地使两个驱动轮转速不同,保持车轮()。
A.全速行驶
B.滚动行驶
C.慢速行驶
D.滑动行驶
参考答案:B
When asked about this major traffic accident, the policeman said it should not have _________ if the driver hadn’t been speeding.
A.come out
B.come about
C.come across
D.happen
空气的压缩过程越接近高温过程,消耗的功越多