题目内容
旋转变压器一般采用频率为1至____kHz的正弦交流电源作为激磁信号。
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The four goals in writing include “Unity, support, coherence, and grammar".
In an essay, the author is allowed to touch on some arguments with little relevance to the central topic.
It is important to offer enough evidence in order to prove a point.
Paragraphs should be well connected within an essay.
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