42. According to the relevant regulation, lifeboat should be powered by _______.

To check the setting of the overspeed trip on a diesel powered generator， you would use a （）.

词汇与结构 The flight controls are powered by _________ hydraulic sources: system A and system B.

All ground spoilers are powered by hydraulic system _____ through a control valve and a bypass valve.

New York and other U.S. cities have begun using vehicles powered by natural gas

Already there are many ( ) fuel vehicles on the market, powered by anything from solar power to natural gas.

The boat in this story is referred to as a______. A: sunfish B: motor-and-sail powered launch C: small pleasure cruiser D: sloop

词汇与结构 The roll control surfaces consist of hydraulically powered ailerons and flight spoilers which are controlled by _________ either control wheel.

When it comes to function, electric cars are ______ as reliable as the average gasoline powered vehicles. A: well B: just C: less D: soon

词汇与结构 The flight controls are powered by redundant hydraulic sources: system A and system B. _________ hydraulic system can operate all primary flight controls.