With a good command of reading skills, most students can manage to read()as they could the year before.
A. as twice fast
B. as fast as twice
C. as twice as fast
D. twice as fast
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超过经济速度后,再超过一定的速度后,油耗会大幅度上升。
A. 正确
B. 错误
图纸格式分为()和()种,按标题栏的方位又可将图纸格式分为x型和Y型两种。
链条在小链轮上包角过小的缺点是()
A. 链条铰链易发生胶合
B. 链条易被拉断,承载能力低
C. 同时啮合的齿数少,链条和齿轮磨损快
D. 传动的不均匀性增大