A.4個(gè) B.8個(gè) C.10個(gè) D.16個(gè)
A.U+=U-=0,i+=i-; B.U+=U-=0,i+=i-=0; C.U+=U-,i+=i-=0; D.U+=U-=0,i+≠i-。
A.i2超前i130° B.i2滯后i130° C.i2超前i110° D.i2滯后i110°