It is difficult to determine which limb of the Moon is fully illuminated（）.<br>A:when the Moon is low in the sky at rising or setting<br>B:at the new Moon phase<br>C:when taking Moon sights during daylight<br>D:when the terminator is nearly vertical

It is difficult to determine which limb of the Moon is fully illuminated（）.
A:when the Moon is low in the sky at rising or setting
B:at the new Moon phase
C:when taking Moon sights during daylight
D:when the terminator is nearly vertical

出自：海船船员证

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