A.CBA/J B.BALB/CAnN C.C57BL/6 D.C3H/He
A.飼養(yǎng)環(huán)境 B.乳腺腫瘤病毒 C.是否繁殖產(chǎn)仔 D.乳汁或胎盤的感染途徑
A.CBA/J B.BALB/CAnN