Before sailing，mariners on duty shall check the headings of magnetic compass by comparison with（）.<br>A:ship's clock<br>B:engine movement recorder<br>C:repeaters<br>D:navigation lights

Before sailing，mariners on duty shall check the headings of magnetic compass by comparison with（）.
A:ship's clock
B:engine movement recorder
C:repeaters
D:navigation lights

出自：海船船员证

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