99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

單項(xiàng)選擇題

The DC excitation to the field of brushless synchronous is generally produced by （）

A.an exciter driven by the same shaft with the generator
B.an exciter driven by external prime mover
C.generator itself
D.either A and B

你可能感興趣的試題

單項(xiàng)選擇題

Which of the following equipment is not pollution prevention equipment?（）

A.oily water separator
B.sewage treatment plant
C.fuel oil separator
D.incinerator

單項(xiàng)選擇題

The initial voltage of self-excitation generator set up by（）

A.residual magnetism
B.voltage regulator
C.electrical current for excitation
D.the other running generator

<ruby id="cziep"><xmp id="cziep"></xmp></ruby>

<ins id="cziep"><xmp id="cziep"></xmp></ins>

<pre id="cziep"><acronym id="cziep"></acronym></pre>