單項(xiàng)選擇題How should you signal the crane operator to use the main hoist?（）.

A.Use one hand to give any miotion signal , and place the other hand motionless in front of the hand giving the motion signal
B.Extend arm with the thumb pointing up , and flex the fingers in and out for as long as the load movement is desired
C.First tap your elbow with one hand , and then proceed to use regular signals
D.First tap the top of your head with your first , and then proceed to use regular signals


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1.單項(xiàng)選擇題I have steerage way.It is said that（）.

A.I am underway
B.I am out of control
C.I am not making way through the water
D.I have the amout of movement forward which the ship need to be steered properly

2.單項(xiàng)選擇題I saw your man not operating the winch gear（）gear.

A.in
B.by
C.of
D.against

3.單項(xiàng)選擇題If a davit-launched life raft aboard a vessel cannot be launched because of damage to the davit,you should（）.

A.inflate the life raft on deck
B.roll the life raft over the side
C.go to another life raft station
D.get a saw and cut the life raft free

4.單項(xiàng)選擇題If a firefighting situation calls for low-velocity fog you would（）.

A.order the engine room to reduce pressure on the fire pump
B.put the lever on an all-purpose fire nozzle all the way forward
C.attach a low-velocity fog applicator with the nozzle shut down
D.put the lever on an all-purpose fire nozzle all the way back

5.單項(xiàng)選擇題If a hydraulic pump on a winch accidentally stops while hoisting,the load will stay suspended because（）.

A.a check valve will close that prevents reverse circulation
B.a centrifugal counterweight counteracts the force of gravity
C.the electric pump motor cut out
D.the control lever will move to the stop position