英语词汇step speed change怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	step speed change
释义	step speed change 简明释义有级变速网络释义 1 [机]?有级变速 ... step soldering 层次软钎焊 step speed changing 有级变速 step valve 阶式阀 ... 2 ?分级变速数控机床主旋转运动无级调速传动设计-中数休闲关键词：无级调速；主旋转运动；分级变速 [gap=4917]Key words:stepless speed variation;principal rotation motion;step speed changing 双语例句 1 Step motor control, by pulse by changing the order of electricity can change the motor rotation direction, change the pulse frequency can change the motor rotation speed. 步进电机受脉冲的控制，通过改变通电的顺序可改变电机的旋转方向，改变脉冲的频率可改变电机的旋转速度。
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