病原微生物的毒力由两方面组成,即()和().
参考答案:毒力;侵袭力
— I told him not to play football in the street.
— ________. But he turned a deaf ear to me.
A.Neither did I
B.So did I
C.No, he didn’t
D.So I did
冰机运行中有异常响声的原因有哪些?