单项选择题

An example of a modern anchor which has a stock is a(n)（）.

A.articulated anchor
B.Flipper Delta anchor
C.Baldt anchor
D.Danforth anchor

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An example of a messenger is a（）.

A.fairlead
B.heaving line
C.stay
D.warp

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All electrical appliances aboard a vessel should be grounded to（）.

A.prevent them from falling when the vessel rolls
B.protect personnel from electrical shock
C.increase their operating efficiency
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单项选择题

All echo-sounders can measure the（）.

A.actual depth of water
B.actual depth of water below keel
C.average depth from waterline to hard bottom
D.average depth of water to soft bottom