单项选择题
A.is changing clockwise in direction
B.is changing anticlockwise in direction
C.is changing cyclonically or variably in direction
D.remains unchanged in direction at the time
单项选择题 When a feature remains in its existing charted position but has a change of characteristic,（）command is used on a chart.
单项选择题 Any action to avoid collision shall,if the circumstances of the case admit,（）,made in ample time and with due regard to the observance of good seamanship.
单项选择题 Which one of the followings is not required on survival crafts?（）