A.Globe valve
B.Butterfly valve
C.Gate valve
D.Packless valve
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A.swivel
B.cathead spool
C.drawworks
D.stand pipe
A.at each frame
B.amidships
C.one-third the distance from the bow
D.one-third the distance from the stern
A.greater at the bow and stern
B.reduced at the bow and stern
C.uniform over the length of the vessel
D.uniform over the length of the vessel，with the exception of the machinery spaces，where it is reduced due to increased stresses
A.Safe working load
B.Ship's working lift
C.Starboard wing lift
D.Stress，weight，load
A.crow bar
B.device to force a water tight door against the frame
C.heavy steel beam
D.wedge
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Each cylinder in a two stroke cycle engine experiences combustion（）.
An integral part of a blowout preventer that serves as the closing element on an open hole，and whose ends do not fit around the drill pipe but seal against each other and shut off the space below completely is the（）.
The C02 flooding system is actuated by a sequence of steps which are（）.
The series of valves used to control the return flow in well control operations is called the（）.
Anchors are prevented from running out when secured by the（）.
The function of the bypass valve on the self-contained breathing apparatus is to（）.
In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open?（）.
If a gasoline engine turns over freely but will not start，the cause is generally（）.
The exhaust pipe must be gas tight throughout its entire length otherwise（）.
In ship operations，hoisting and lowering pipe in and out of the drilled hole is the main function of the（）.