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
更多“The boom stops are installed on an offshore crane to（）.”相关的问题
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、Stopping the boom B、Topping or lowering the boom C、Moving the boom left or right D、All of the above
A、being raised too high B、swinging at sea C、overloading when not in use D、being lowered too low
A、A.the lubricating pumps are stopped and the access doors are opened B、B.the lubricating pumps are running and the access doors are opened C、C.the engine is running and the access doors are closed D、D.the engine is stopped and the access doors are closed
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