单项选择题
A.it gets dark in color B.a sample rubbed between fingers feels thin C.it has been in use for a specified interval D.it no longer supports combustion
If your propeller is racing in rough weather，you should...
单项选择题If your propeller is racing in rough weather，you should（）.
A.decrease your engine speed B.ignore it C.increase your engine speed D.stop your engine until the rough weather passes
If you are unable to stop a diesel engine by any other ...
单项选择题If you are unable to stop a diesel engine by any other means，you should（）.
A.discharge a CO2 extinguisher in the air inlet B.pull off the distributor cap C.secure the jacket water D.secure the starting air supply valve
If ignited，which material would be a class B fire?（）A.M...
单项选择题If ignited，which material would be a class B fire?（）
A.Magnesium B.Paper C.Wood D.Diesel Oil
