【单选题】若电路中某元件两端的电压u=3n(314t-π/2)V,电流i=4sin(314t)A,则该元件是( )
【简答题】What is an e–reader? An e–reader is a small computer. It can hold thousands of e–books. So people want to throw away heavy schoolbags and read with small, light e–readers. For example, a US high...
【单选题】若电路中某元件两端的电压u=3n(314t-π/2)V,电流i=4sin(314t)A,则该元件是( )
【简答题】若电路中某元件两端的电压U=3n(314t-1800)伏,电流i=4sin(314t+1800)安,则该元件是电容。()
【单选题】若电路中某元件两端的电压u=3n(314t-π/2)V,电流i=4sin(314t)A,则该元件是( )
【单选题】What can a reader learn about in this text?
A.
the life of schoolchildren in Mongolia
B.
the difficulties for blind travellers
C.
the international work of some eye doctors
D.
the best way of studying medicine
【单选题】关节内有游离体会如何影响关节活动范围( )
【判断题】支付宝与淘宝联系最为紧密,这是得益于“阿里系”的线上联合。( )
【简答题】高频放大器 , 能把输入信号的电压或功率放大的无线电装置
【单选题】若电路中某元件两端的电压u=3n(314t-180)V,电流i=4sin(314t+1800)A,则该元件是()。