问题
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
答案
参考答案：A
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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
参考答案：A