下列皮试液每毫升的含量哪项正确()。
A.青霉素50U
B.链霉素2500U
C.普鲁卡因25mg
D.细胞色素C7.5mg
E.破伤风抗毒素1500IU
参考答案:B
I ______ to send him a gift to congratulate him on his marriage, but I _____ it.
A.hoped; hadn’t managed
B.hoped; didn’t manage
C.hope; don’t manage
D.had hoped; didn’t manage
免疫对机体是()
A.有利的
B.有害的
C.有利也有害
D.有利无害
E.正常条件下有利,异常条件下有害