According to the design, cars will be elevated to the electrically-powered freeway system.

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 （）.

Depending on the power sources, pumps used in hydraulic system are divided into engine driven pump, electrically driven pump and hand pump.

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.

‌If it’s a RSVP with email in the invitation, you may accept or decline the invitation __________ by sending an email.​‌​ A: electively B: selectively C: electronically D: electrically

A point charge q is placed inside a cavity within a conductor. The conductor is electrically neutral and is isolated . The total charge on the outer surface of the conductor must be ______.

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.