单词：sine wave form
sine wave form的用法和样例：
例句
- A sine wave shape is valid for many motors and it is a good approximation if the shape of the BEMF differs for a given motor.其实，一般而言，很多的电动机所产生的反电动势都是正弦波形状的，而且即使不是正弦波形状，也会比较接近正弦波的形式。
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