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.
A.MOVE
B.DELETE
C.AMEND
D.SUBSTITUTE
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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.
A.be initiative
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Which one of the followings is not required on survival crafts?（）
A.Anti-seasickness medicine
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