单选题When shall the stand-on vessel in a crossing situation take action to avoid the other vessel（）.AWhen a risk of collision existsBWhen action by the give-way vessel alone will not prevent a collisionCWhen the bearing to give-way vessel becomes steadyDWhen the vessels become less than 1/2 mile apart
单选题
When shall the stand-on vessel in a crossing situation take action to avoid the other vessel（）.
A
When a risk of collision exists
B
When action by the give-way vessel alone will not prevent a collision
C
When the bearing to give-way vessel becomes steady
D
When the vessels become less than 1/2 mile apart
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