猪瘟的特征性病理变化是脾脏出现()
A.肿大
B.萎缩
C.梗死
D.出血
E.坏死灶
参考答案:C
I will never forget the classmates ______ I studied with.
A.that
B.which
C.whose
D.whom
拨打“120”急救电话时要注意些什么?