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During the day，a vessel picking up a submarine cable shall carry（）.
A:three shapes，the highest and lowest shall be red balls，and the middle shall be a white diamond
B:two black balls
C:three shapes; the highest and lowest shall be black balls，and the middle shall be a red diamond
D:three shapes; the highest and lowest shall be black balls and the middle shall be a black diamond

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出自：海船船员证

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