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
The most common type of davit found on merchant vessels today is the（）.
The connected joints of pipe，usually made of three joints of pipe approximately 90 feet long，racked in the derrick when making a trip are called a（）.
The boat is stowed on the davit rather than on a cradle with which type of davit?（）
Static electricity may be built up by the（）.
In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open?（）.
On a ship，a door that is required to be marked KEEP CLOSED is designed to（）.
As oil pipe line connections were broken，（）quantity of oil was caused to spill onto the wharf and into the dock water.
The bypass valve on a self-contained breathing device should be opened if（）.
The extension of the after part of the keel in a single-screw vessel upon which the stern post rests is called the（）.
If a gasoline engine turns over freely but will not start，the cause is generally（）.