A.flow of petroleum through pipes
B.spraying or splashing of petroleum
C.settling of solids or water in petroleum
D.All of the above
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A.pump out
B.to pump out
C.pumping out
D.be pumped out
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
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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（）.
An LWT anchor often has difficulty tripping in（）.
The portable radio apparatus means（）.
Each cylinder in a two stroke cycle engine experiences combustion（）.
The series of valves used to control the return flow in well control operations is called the（）.
The C02 flooding system is actuated by a sequence of steps which are（）.
All electrical appliances aboard a vessel should be grounded to（）.
The purpose of a bilge well is to（）.
In ship operations，hoisting and lowering pipe in and out of the drilled hole is the main function of the（）.
In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open?（）.