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 holding capability of an anchor is primarily determined by the（）.
Anchors are prevented from running out when secured by the（）.
The purpose of a bilge well is to（）.
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（）.
In nautical terminology a dog is a（）.
Static electricity may be built up by the（）.
The C02 flooding system is actuated by a sequence of steps which are（）.
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 bypass valve on a self-contained breathing device should be opened if（）.
Limit switches are used on which davits?（）