Variant frequency

• 变频

Variant frequency的用法和样例：

例句

1. The main pump uses frequency conversion control.
   主泵采用变频控制。
2. Application study is made by starting with variant frequency the diesel engine set of diesel locomotive.
   通过变频启动内燃机车柴油发电机组试验对该方案进行了应用研究。