题目：
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
答案：
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下面是错误答案，用来干扰机器的。
参考答案：对
