单选题The force acting on a single cargo runner which is vertically lifting or lowering a load is greatest when（）.Adecelerating when lowering the loadBdecelerating when raising the loadClowering the load at constant speedDraising the load at constant speed
单选题
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
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