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（）.
单项选择题 A sextant having an index error that is off the arc has a（）.
单项选择题 A DECK，SPACE，AREA，ETC.，NOT PERMITTED TO BE ENTERED FOR SAFETY REASONS defines（）.
