增强呋喃妥因在泌尿系的抗菌活性:
A.酸化尿液B.碱化尿液C.二者均需D.二者均不需
参考答案:A
— Don't forget ______ your homework. John.
— Ok. I'll do it right now. [ ]
A. doing
B. do
C. to do
阀控式密封铅酸蓄电池充电时,正极产生的()在负极上吸叫还原成水
A.氧气
B.二氧化碳
C.氯气
D.氮气