The engine of the ship was out of order and the bad weather _____ the helplessness of the crew（船员） at sea.

A．added to

B．resulted from

C．turned out

D．made up

装卸活动是（）。

A.出现的频率低

B.出现的频率高

C.装卸时间长，耗人力多

D.装卸费用占的比重高

E.是降低物流费用的重要环节