單項選擇題

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

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單項選擇題

The cargo，when（），should be completely covered with plastic.

A.stow
B.stowing
C.stowed
D.be stowed

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