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
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.
单项选择题 The cargo，when（），should be completely covered with plastic.
