单选题When shall the stand-on vessel change course and speed?（）Athe stand-on vessel may change course and speed at any time as it has the right of wayBafter the give-way vessel sounds one blast in a crossing situationCwhen action by the give-way vessel alone cannot prevent collisionDwhen the two vessels become less than half a mile apart
单选题
When shall the stand-on vessel change course and speed?（）
A
the stand-on vessel may change course and speed at any time as it has the right of way
B
after the give-way vessel sounds one blast in a crossing situation
C
when action by the give-way vessel alone cannot prevent collision
D
when the two vessels become less than half a mile apart
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