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單項選擇題

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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單項選擇題

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

單項選擇題

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