单项选择题
An example of a messenger is a（）.
A.fairlead
B.heaving line
C.stay
D.warp
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相关考题
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单项选择题
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
D.prevent unauthorized personnel from operating them -
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 -
单项选择题
Aboard ship，vertical flat plates running transversely and connecting the vertical keel to the margin plates are called（）.
A.floors
B.intercostals
C.girders
D.stringers
