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單項(xiàng)選擇題

A large basin cut into the shore，closed off by a caisson，and used for drydocking of ships is known as a（）.

A.slipway
B.graving dock
C.ground warp
D.caisson dock

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單項(xiàng)選擇題

（） is not usually used in liquid cargo systems.

A.Hydraulic drive systems
B.Electric drive systems
C.Steam drive systems
D.Man-powered drive systems

單項(xiàng)選擇題

（） is not one of the winch controls.

A.a master controller or switchbox
B.a group of relays
C.contactors
D.a solenoid brake

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