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
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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
