单项选择题

A.blind flangeB.pivot couplingC.quick-release couplingD……

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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热门试题

单项选择题A ship crane which has been idle for a period of over six months shall be inspected to the same standards as a（）.

A.yearly inspection
B.quarterly inspection
C.monthly inspection
D.weekly inspection

单项选择题A sheepshank is used to（）.

A.keep a line from fraying
B.join lines of unequal size
C.stop off a line
D.shorten a line

单项选择题A sextant having an index error that is off the arc has a（）.

A.positive correction
B.dip error
C.negative correction
D.semidiameter error

单项选择题A DECK，SPACE，AREA，ETC.，NOT PERMITTED TO BE ENTERED FOR SAFETY REASONS defines（）.

A.Restricted area
B.Closed area
C.Prohibited place
D.Forbidden place

单项选择题The Vessel is fully fitted with cargo（）.

A.beats
B.beasts
C.bacons
D.battens