How many operators are needed／required on board according to the provisions of the International Convention for the Safety of Life at Sea，1974?（）.<br>A:4 operators<br>B:3 operators<br>C:2 operators<br>D:1 operator

How many operators are needed／required on board according to the provisions of the International Convention for the Safety of Life at Sea，1974?（）.
A:4 operators
B:3 operators
C:2 operators
D:1 operator

出自：海船船员证

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