A.Crescent
B.Sheath-screw boom
C.Quadrantal
D.Radial
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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
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
最新試題
In nautical terminology a dog is a（）.
In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open?（）.
An example of a messenger is a（）.
As the propeller turns，voids are formed on the trailing and leading edges of the propeller blades causing a loss of propulsive efficiency，pitting of the blades，and vibration. These voids are known as（）.
The portable radio apparatus means（）.
In ship construction，frame spacing is（）.
Permission is kindly requested（）the ballast water.
The most common type of davit found on merchant vessels today is the（）.
Centrifugal pumps have what advantage(s) over reciprocating pumps?（）.
All electrical appliances aboard a vessel should be grounded to（）.