A.Stopping the boom
B.Topping or lowering the boom
C.Moving the boom left or right
D.All of the above
您可能感興趣的試卷
你可能感興趣的試題
A.It prevents the load from swinging when the boom level is adjusted
B.Less power is needed when topping the boom with a load on the hook
C.It maintains the height of the load above the deck
D.All of the above
A.started
B.finished
C.completed
D.reported
最新試題
Where is the most probable location of the remote shutdown station for cargo pumps on a tank barge carrying oil（）.
Which of the following statement（s）is/are FALSE regarding a twin pedestal crane set （）.
Which of the following statement（s）is/are TRUE regarding a twin pedestal crane set（）.
How should you signal the crane operator to hoist（）.
The net productivity per gang-hour can be improved through a decrease of（）.