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
最新試題
If the engine of a survival craft does not start，check to see（）.
The most common type of davit found on merchant vessels today is the（）.
Limit switches are used on which davits?（）
If a gasoline engine turns over freely but will not start，the cause is generally（）.
The portable radio apparatus means（）.
An example of a messenger is a（）.
The holding capability of an anchor is primarily determined by the（）.
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 boat is stowed on the davit rather than on a cradle with which type of davit?（）