单项选择题
The sprinkler system of an enclosed lifeboat is used to（）.
A.cool the craft in a fire B.cool the engine C.spray oil on the sea to calm it D.spray personnel during a fire
单项选择题 The sea painter of a rescue boat should be led（）.
单项选择题 The sea anchor shown as item number 14 will NOT（）.
单项选择题 The reference datum used in determining the heights of land features on most charts is（）.
