A.brake
B.devil's claw
C.pawls
D.All of the above
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A.sand
B.soft soil
C.stiff clay
D.heterogeneous soil
A.shear ram
B.blind ram
C.pipe ram
D.annular ram
A.articulated anchor
B.Flipper Delta anchor
C.Baldt anchor
D.Danforth anchor
A.fairlead
B.heaving line
C.stay
D.warp
A.prevent them from falling when the vessel rolls
B.protect personnel from electrical shock
C.increase their operating efficiency
D.prevent unauthorized personnel from operating them
最新試題
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（）.
An LWT anchor often has difficulty tripping in（）.
In nautical terminology a dog is a（）.
The most common type of davit found on merchant vessels today is the（）.
The holding capability of an anchor is primarily determined by the（）.
Permission is kindly requested（）the ballast water.
In ship construction，keel scantlings should be the greatest（）.
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（）.