A、being raised too high
B、swinging at sea
C、overloading when not in use
D、being lowered too low
更多“The boom stops on a pedestal crane prevent the boom from（）.”相关的问题
A、prevent the boom from being raised too high B、prevent the boom from swinging C、support the boom when not in use D、prevent the boom from being lowered
A、Stopping the boom B、Topping or lowering the boom C、Moving the boom left or right D、All of the above
A、length of the boom B、angle of the boom C、lifting capacity of the boom D、direction of the boom
A、Directly under the boom B、Moving away from the boom C、Stopped dead in the water D、Tied to the boom
A、directly under the boom B、moving away from the boom C、stopped dead in the water D、tied to the boom
A、increases as the cargo closes the head while hoisting B、increases if the cargo runner is doubled up C、decreases as the boom is topped to a greater angle D、is determined by the thrust stresses on the boom
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