In a four-stroke/cycle diesel engine, the camshaft rotates at ()
A. twice the crankshaft speed
B. half the crankshaft speed
C. the same speed as that of the crankshaft
D. a speed independent of that of the crankshaft
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掘进工作面的通风是采用()。
A. 压缩空气
B. 主扇
C. 辅扇
D. 局扇
苫盖易于损坏篷布的货物时,承运人必须采取防护措施。
A. 正确
B. 错误