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
更多“The force acting on a single cargo runner which is vertically lifting or lowering a load is greatest when（）.”相关的问题
A、upward-acting weight force B、downward-acting weight force C、upward-acting buoyant force D、environmental force
A、the center of the hydrodynamic forces acting on the underwater hull to resist the effect of the wind B、the point of influence of wind on the ship C、the pivot point D、the point on the ship's above-water structure upon which the whole force of the wind can be considered an act
A、It forces the bow away from the bank B、It forces the stern away from the bank C、It forces the entire vessel away from the bank D、It heels the vessel toward the bank
A、north magnetic pole B、south magnetic pole C、magnetic prime vertical meridian D、magnetic equator
A、opposite directions on the same line，tending to pull the material apart B、opposite directions on the same line，tending to compress the object C、opposite directions along parallel lines D、the same direction along parallel lines
A、Power piston B、Control rack C、Weights acted on by centrifugal force D、Isochronous droop spring
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