单项选择题
An engine compartment gasoline fire requires which type of extinguisher?（）.
A.Carbon dioxide B.Dry chemical C.Foam D.All of the above
单项选择题 An example of a messenger is a（）.
单项选择题 An inflatable life raft can be launched by（）.
单项选择题 An inflatable life raft is hand-launched by（）.
