單項(xiàng)選擇題A single fitting installed in a pipeline that either blanks off the pipe or allows a full flow passage of a liquid through the pipe is referred to as a().

A.blind flange
B.pivot coupling
C.quick-release coupling
D.spectacle flange


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1.單項(xiàng)選擇題A spreader bar is used to().

A.increase the lifting capacity
B.increase the lifting radius
C.protect the slings
D.protect the upper part of a load

2.單項(xiàng)選擇題A strong back refers to a().

A.bar securing a cargo port
B.centerline vertical bulkhead
C.deep beam
D.spanner stay

3.單項(xiàng)選擇題A tank which is not completely full or empty is called().

A.pressed
B.slack
C.inertial
D.elemental

4.單項(xiàng)選擇題A venetian vent or rice ventilator is used in stowage of which cargo?().

A.Bagged cargo
B.Bulk grain
C.Bulk rice
D.Refrigerated goods

5.單項(xiàng)選擇題A vertical shife of weight to a position above the vessel''s center of gravity will().

A.increase reserve buoyancy
B.decrease the righting moment
C.decrease KG
D.increase KM