There are（）NCSs in total, one in each ocean region, the AOR (E and W), IOR and POR.<br>A:3<br>B:2<br>C:1<br>D:4

There are（）NCSs in total, one in each ocean region, the AOR (E and W), IOR and POR.
A:3
B:2
C:1
D:4

出自：海船船员证

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