If you hear a continuous blast of the ship’s whistle for a period of a period of not less than 10 saconds supplemented by a continuous ringing of the general alarm bells for not less than 10 seconds,you should go to your（）.

A.boat station

B.fire station

C.man overboard station

D.collision station

控制测量阶段包括（）

A、清绘原图

B、检校仪器

C、高程测量

D、平差计算