97免费在线观看视频,亚洲综合自拍网,黄色毛片免费观看,热久久综合网,免费看日产一区二区三区狠狠操av,久久久涩涩涩,在线精品免费视频,人人插天天干,久久91精品国产91久久

<pre id="9fkku"></pre>

<pre id="9fkku"></pre>

<pre id="9fkku"><strong id="9fkku"></strong></pre>

<pre id="9fkku"></pre>

<ins id="9fkku"></ins>

<dl id="9fkku"><strong id="9fkku"></strong></dl>

單項選擇題

The field coils（） and the armature is（）This is in fact the arrangement adopted for large, heavy duty alternators.

A.stationary；rotate
B.stationary；stationary
C.rotate；stationary
D.rotate；rotate

你可能感興趣的試題

單項選擇題

The power factor is a measure of the phase difference between voltage and current and is expressed as the（） of the phase angle.

A.sine
B.cosine
C.tangent
D.cotangent

單項選擇題

With a purely resistance load the voltage and current are in phase, giving a power factor of （）.

A.one
B.less than one
C.more than one
D.negative one

<blockquote id="xppcn"></blockquote>