题目内容
（请给出正确答案）
[单选题]
According to the STCW Convention, a proper look-out shall serve the purposes except__（）
A.maintaining a continuous state of vigilance
B.fully appraising the situation and the risk of collision
C.ensuring an unobstructed all-round view
D.detecting ships and aircraft in distress
答案
C、ensuring an unobstructed all-round view
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