1. [单选题]An alarm device inserted between the deaerating tank and the expansion tank can notify the on-watching crew that .
A. the expansion tank is lack of water
B. the expansion tank is over flowing
C. there is something wrong with the cooling system
D. there is something wrong with the engine
2. [单选题]互见中，一艘从事捕鱼的船舶与其右舷一艘驶帆的船舶相遇致有构成碰撞危险，则________。
A. 两船负有同等的避让责任和义务
B. 从事捕鱼的船舶应避让帆船
C. 帆船应避让从事捕鱼的船舶
D. 帆船不应妨碍从事捕鱼的船舶的航行
