A.pump out
B.to pump out
C.pumping out
D.be pumped out
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A.prevent the passage of flammable gases
B.prevent the passage of poisonous vapors
C.delay the spread of heat and flames
D.maintain watertight integrity
A.Sheath-screw davits
B.Gravity davits
C.Radial davits
D.Quadrantal davits
A.Globe valve
B.Butterfly valve
C.Gate valve
D.Packless valve
A.swivel
B.cathead spool
C.drawworks
D.stand pipe
A.at each frame
B.amidships
C.one-third the distance from the bow
D.one-third the distance from the stern
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The purpose of a bilge well is to（）.
The holding capability of an anchor is primarily determined by the（）.
The portable radio apparatus means（）.
In ship construction，keel scantlings should be the greatest（）.
The exhaust pipe must be gas tight throughout its entire length otherwise（）.
An integral part of a blowout preventer that serves as the closing element on an open hole，and whose ends do not fit around the drill pipe but seal against each other and shut off the space below completely is the（）.
The most common type of davit found on merchant vessels today is the（）.
The C02 flooding system is actuated by a sequence of steps which are（）.