单项选择题
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
The cargo，when（），should be completely covered with plas...
单项选择题The cargo，when（），should be completely covered with plastic.
A.stow B.stowing C.stowed D.be stowed
