0,b B.a(chǎn)>0,b>0 C.a(chǎn) D.a(chǎn) 0 [答案] D [解析] 復(fù)數(shù)z=a+bi在復(fù)平面內(nèi)的對應(yīng)點(diǎn)坐標(biāo)" />