“种差”用英语怎么说？

本实用新型涉及一种差动交流调速电动机装置.The utility model relates to a differential alternating current adjustable - speed motor device.显然该新型差动保护兼有两种差动保护优势.It is evidently that novel scheme obtains both excellences of the above two differe...

“种差”的拼音为：zhǒng chā...