1. [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 ().
A. be regarded as a vessel not under command
B. be regarded as a vessel underway
C. be regarded as a vessel
D. be regarded as a sailing vessel
2. [单选题]一机帆并用的船舶驶近你船左舷时，你应________。
A. 左转从他船尾通过
B. 停车
C. 右转并让清
D. 保向保速
3. [单选题]What is the best explanation to the underline phrase "to secure the smooth withdrawal of ships"?
A. To withdraw a ship mid make it in a safe condition
B. To secure the life of a ship and recycle it
C. To break a wreck
D. To finish the service of a ship and break it without other problems
