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
The extension of the after part of the keel in a single-screw vessel upon which the stern post rests is called the（）.
All electrical appliances aboard a vessel should be grounded to（）.
Cargo pump relief valves are piped to the（）.
The bypass valve on a self-contained breathing device should be opened if（）.
The C02 flooding system is actuated by a sequence of steps which are（）.
In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open?（）.
The function of the bypass valve on the self-contained breathing apparatus is to（）.
The holding capability of an anchor is primarily determined by the（）.
Limit switches are used on which davits?（）
On a ship，a door that is required to be marked KEEP CLOSED is designed to（）.