单项选择题
A bad separation makes the cargo（）at its destination.
A.easier to discharge B.more difficult to discharge C.easierto load D.more difficult to load
单项选择题 A number of bags are worn-out（）a certain extent.
单项选择题 A vessel fitted with twin screws is easier in（）than a vessel with single screw.
单项选择题 Advise you（）engines.
