單項(xiàng)選擇題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().

A.shear ram
B.blind ram
C.pipe ram
D.annular ram


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1.單項(xiàng)選擇題An example of a modern anchor which has a stock is a(n)().

A.articulated anchor
B.Flipper Delta anchor
C.Baldt anchor
D.Danforth anchor

2.單項(xiàng)選擇題An example of a messenger is a().

A.fairlead
B.heaving line
C.stay
D.warp

3.單項(xiàng)選擇題All electrical appliances aboard a vessel should be grounded to().

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

4.單項(xiàng)選擇題All echo-sounders can measure the().

A.actual depth of water
B.actual depth of water below keel
C.average depth from waterline to hard bottom
D.average depth of water to soft bottom