[单选题]If a seaplane is not used as a means of transpiration on water but is capable of being used so，it shall ().

正确答案 ：C

be regarded as a vessel

[单选题]一机帆并用的船舶驶近你船左舷时，你应________。

正确答案 ：D

保向保速

[单选题]What is the best explanation to the underline phrase "to secure the smooth withdrawal of ships"?

正确答案 ：A

To withdraw a ship mid make it in a safe condition

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