In general，the most effective period for observing stars and planets occurs during the darker limit of（）. -题库考试答案搜索网

In general，the most effective period for observing stars and planets occurs during the darker limit of（）.

单选题

2022-01-03 19:45

A、sunset
B、civil twilight
C、nautical twilight
D、astronomical twilight

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正确答案

B

试题解析

标签：天文航海

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