单项选择题
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
The foreman says that the stevedores stopped working ow...
单项选择题The foreman says that the stevedores stopped working owing to the（）of the winch.
A.breakdown B.breaked down C.broken down D.broke down
The force acting on a single cargo runner which is vert...
单项选择题The force acting on a single cargo runner which is vertically lifting or lowering a load is greatest when（）.
A.decelerating when lowering the load B.decelerating when raising the load C.lowering the load at constant speed D.raising the load at constant speed
The Chief Tally would like to inquire（）the rotation of ...
单项选择题The Chief Tally would like to inquire（）the rotation of the discharging ports.
A.at B.on C.about D.after
