变换气中CO2浓度降低,可以提高CO的变换率。
参考答案:对
She was afraid ________ the yard because she was afraid ________ by the big dog
________ at the gate. [ ]
A. to go into; to be bitten; lay
B. of going into; to bite; laying
C. of going into; to be bitten; lying
D. to go into; of being bitten; lying
以下关于中成药非处方药的描述,错误的是( )
A.简称OTCB.不需要凭执业医师处方即可购买C.患者和家属可直接从药店购买D.分为甲、乙、丙三类非处方药E.患者和家属可直接从超市购买