单项选择题
A.Not under-way
B.Not under command
C.Restricted in her ability to maneuver
D.A non-displacement ship
单项选择题 When shall the stand-on vessel in a crossing situation take action to avoid the other vessel（）.
单项选择题 When one upbound vessel is overtaking another vessel and both are pushing a tow ahead，what reaction may you expect（）.
单项选择题 When one of two vessels（）is required to keep out of the way the other must keep her course and speed.