A.fairlead
B.heaving line
C.stay
D.warp
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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
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
A.floors
B.intercostals
C.girders
D.stringers
A.camel
B.dolphin
C.rat guard
D.wedge
A.bottom floor
B.outer bottom
C.shear plating
D.tank top
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The extension of the after part of the keel in a single-screw vessel upon which the stern post rests is called the（）.
Cargo pump relief valves are piped to the（）.
Limit switches are used on which davits?（）
In ship construction，frame spacing is（）.
The purpose of a bilge well is to（）.
The exhaust pipe must be gas tight throughout its entire length otherwise（）.
The function of the bypass valve on the self-contained breathing apparatus is to（）.
In nautical terminology a dog is a（）.
The portable radio apparatus means（）.
Permission is kindly requested（）the ballast water.