问题
单项选择题
In particular,which is not included in the Navigation System?（）
A.ECDIS
B.RADAR
C.GPS
D.GMDSS
答案
参考答案：D
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In particular,which is not included in the Navigation System?（）
A.ECDIS
B.RADAR
C.GPS
D.GMDSS
参考答案：D