单选题How many operators are needed／required on board according to the provisions of the International Convention for the Safety of Life at Sea，1974?（）.A4 operatorsB3 operatorsC2 operatorsD1 operator
单选题
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
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