问题
单项选择题
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
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
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
参考答案：D