单项选择题
The signal for fire alarm on a ship must be indicated（）.
A.at each alarm bell B.at each alarm actuator C.near all exits D.on the station bill
单项选择题 The patrolman，while on duty on a passenger vessel，must have in his possession a(n)（）.
单项选择题 The only type of helicopter that may be refueled with the engine running and the blades turning is（）.
单项选择题 The most likely location for a liquid cargo fire to occur on a tanker would be（）.
