单项选择题
The full utilization of berths can be achieved if（）.
A.ships arrive at random B.cargo-handling time varies greatly C.ships have to queue to get onto berths D.ships do not have to wait to get onto berths
单项选择题 The foreman says that the stevedores stopped working owing to the（）of the winch.
单项选择题 The force acting on a single cargo runner which is vertically lifting or lowering a load is greatest when（）.
单项选择题 The Chief Tally would like to inquire（）the rotation of the discharging ports.
