單項(xiàng)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

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單項(xiàng)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

單項(xiàng)選擇題

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

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