直流电动机通常采用哪些起动方法?
参考答案:
直流电动机通常采用降低电源电压起动(降压起动)和电枢回路串电阻起动(变阻起动)。
一个体重60kg的人,血量约为
A.3000~3500ml
B.3500~4000ml
C.4200~4800ml
D.5000~5600ml
E.5800~6200ml
Where is Kate?()
A.She's in England.
B.She's from London
C.She's a nurse in England.
D.She is English