单项选择题

If you came into contact with nitrobenzene while disconnecting the cargo hose，you should be aware that it is（）.

A.highly toxic when absorbed through the skin
B.a blood poison
C.a nerve poison
D.All of the above

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单项选择题

If a void occurs in the cargo hold，it is better to（）to control the broken stowage.

A.brace it with dunnage
B.cover it with large pieces
C.fill it with small pieces
D.leave it as it is

单项选择题

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 will cut out
D.the control lever will move to the stop position