A.實(shí)部為零的共軛復(fù)數(shù) B.相等的負(fù)實(shí)數(shù) C.相等的正實(shí)數(shù) D.正、負(fù)兩實(shí)數(shù)
A.-7 B.3.5 C.2 D.1/7