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單項(xiàng)選擇題

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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