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 a gasoline engine turns over freely but will not start，the cause is generally（）.
Limit switches are used on which davits?（）
The portable radio apparatus means（）.
All electrical appliances aboard a vessel should be grounded to（）.
If the engine of a survival craft does not start，check to see（）.
In relation to cargo gear，what does SWL mean?（）.
The exhaust pipe must be gas tight throughout its entire length otherwise（）.
An LWT anchor often has difficulty tripping in（）.
Centrifugal pumps have what advantage(s) over reciprocating pumps?（）.
Permission is kindly requested（）the ballast water.