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單項(xiàng)選擇題

A sling is a device used in（）.

A.hoisting cargo aboard a vessel
B.hoisting personnel aboard a vessel
C.securing a small boat to a large vessel
D.hoisting the anchor

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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

單項(xiàng)選擇題

Which action will affect the trim of a vessel? （）

A.Moving high weights lower
B.Adding weight at the tipping center
C.Moving a weight forward
D.Moving lower weight high