单项选择题
The risk of collision shall be deemed to exist if the compass bearing of an approaching vessel （）.
A.did not appreciably change B.does not appreciably change C.do not appreciably change D.not appreciably change
单项选择题 The effectiveness of the action shall be carefully checked until the other vessel is finally （）.
单项选择题 Sailing vessels are stand-on over power-driven vessels except（）.
单项选择题 Risk of collision is considered to exist if（）.
