药物的首过效应是()
A.药物于血浆蛋白结合
B.肝脏对药物的转化
C.口服药物后对胃的刺激
D.肌注药物后对组织的刺激
E.皮肤给药后药物的吸收作用
参考答案:B
So far, the criminals____ by the police.[ ]
A. had been discovered
B. have been discovered
C. are discovered
D. will be discovered
试述泄泻与痢疾的鉴别要点