单选题During the day，a vessel picking up a submarine cable shall carry（）.AThree shapes，the highest and lowest shall be red balls，and the middle shall be a white diamondBTwo black ballsCThree shapes；the highest and lowest shall be black balls，and the middle shall be a red diamondDThree shapes；the highest and lowest shall be black balls and the middle shall be a black diamond
单选题
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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