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【单选题】
直航船可独自采取操纵行动以避免碰撞的时机为( )。A.
当发现两船业以构成碰撞危险之时
B.
当发现两船业以驶近单凭让路船的行动已经不能避免碰撞
C.
当发现两船业已构成紧迫危险之时
D.
当发现让路船显然未遵照规则规定采取让路行动时
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