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

單項選擇題

Most often （） is attached to the engine-propeller shaft for efficient electric power generation.

A.a variable-speed AC generator
B.a fixed-speed AC generator
C.an air blower
D.a DC generator

你可能感興趣的試題

單項選擇題

In today’s practice, with cylinders of equal diameter of bore and equal revolutions, the two-cycle engine delivers a power about 80 percent （） than that of the four-stroke one.

A.greater
B.better
C.smaller
D.less

單項選擇題

With（） the engine need not to be aligned with reduction gears or propeller shaft.

A.Diesel engine propulsion
B.Diesel electric propulsion
C.Steam engine propulsion
D.Gas turbine propulsion

<pre id="jmx43"><legend id="jmx43"><div id="jmx43"></div></legend></pre>