---

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

---

出自：海船船员证

显示答案