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