单项选择题
She（the vessel）shall if necessary（）and in any event navigate with extreme caution until danger of collision is over.
A.take all her way off B.take her way all off C.take her way off D.take off her all way
单项选择题 SAFE SPEED is defined as that speed where（）.
单项选择题 In order for a stand-on vessel to take action in a situation，she must determine that the other vessel（）.
单项选择题 If your vessel is the stand-on vessel in a crossing situation（）.
