在 R,L 并联的正弦交流电路中, R=40Ω ,X L =30Ω , 电路的无功功率Q=480VA,则视在功率 S为
C
暂无解析
设f(x,y)在点(0,0)附近有定义,且,则
过渡时期的总路线的主体是________。
He________methathedecidedtoleaveonMonday.
Constructionoftherailwayshelpedtodevelopthenational_______ofTanzaniaandZambia.
GeneralMotors,oneoftheworld'slargestautomanufacturers,isexpandingits________inthiscountry.