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单选题
过测者天底和两天极的半个大圆称为（）。
A
测者真地平圈
B
天体时圈
C
测者子圈
D
测者午圈
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应记录在船员服务簿主管机关签注（一）一栏中C
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data logger
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greater fuel economyD
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RemainB
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compressed airC
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