无码高清视频|成人自拍视频|欧美成人午夜无码A片秀色直播|草美女视频网站|美女被操网站在线观看

<sup id="93vuf"><legend id="93vuf"><div id="93vuf"></div></legend></sup>

單項選擇題

（） is a machine by which electrical energy is transformed into mechanical energy.

A.An alternator
B.An electric motor
C.A diesel engine
D.A main switchboard

你可能感興趣的試題

單項選擇題

（） shall be continuously powered and shall have an automatic changeover to a stand by power supply in case of loss of normal power supply.

A.Cooling system
B.Alarm system
C.The air conditioning installation
D.The mooring equipment

單項選擇題

The liquid flowing in the capillary is such that the difference in （） readings taken before the capillary and after it is related to the oil viscosity.

A.pressure
B.velocity
C.flow rate
D.temperature

<pre id="4s73f"><strong id="4s73f"></strong></pre>