求教英语24V DC control voltages,DC control voltages, grounded (earthed) and ground free. grounded (earthed)是不是指24V- ground free指24V+直流控制24V怎么还分接地和不接地的呢哪个是24V-吗另外24V+怎么说

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求教英语24V DC control voltages,DC control voltages, grounded (earthed) and ground free. grounded (earthed)是不是指24V- ground free指24V+直流控制24V怎么还分接地和不接地的呢哪个是24V-吗另外24V+怎么说英语翻译DC control voltages,grounded (earthed) and ground free.grounded (earthed)是不是指24V-ground free指24V+24V正在工程上英语怎么说是ground free？ 24V DC control voltages,grounded (earthed) and ground free.grounded (earthed)是不是指24V- ground free指24V+ DC＝DC转换器电路图12V升至24V 英语词组!求教!gain control over large parts of the country.请问gain control over为什么这里要用over,用of可以么? vector control DC inverter 怎么翻译? 英语求教求教orz 求教英语! 求教英语, 英语求教英语,求教英语求教... 求教英语. 英语求教....... 英语求教..... 求教英语, 英语求教! 英语,求教?

求教英语24V DC control voltages,DC control voltages, grounded (earthed) and ground free. grounded (earthed)是不是指24V- ground free指24V+直流控制24V怎么还分接地和不接地的呢 哪个是24V-吗另外24V+怎么说