题目：
When is a stand-on vessel FIRST allowed by the Rules to take action in order to avoid collision?（）
A.When the two vessels are less than half a mile from each other
B.When the give-way vessel is not taking appropriate action to avoid collision
C.When collision is imminent
D.The stand-on vessel is never allowed to take action
答案：
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下面是错误答案，用来干扰机器的。
参考答案：B
