协同致癌作用机理包括( )。
A.抑制DNA修复
B.选择性增强DNA受损细胞的增殖
C.活化作用酶系统活力发生改变
D.上述AB正确
E.上述AC正确
参考答案:D
A client has just finished his glucose tolerance test. How many hours should it take for his blood glucose level to return to normal ?()
A.2 hours.
B.3 hours.
C.5 hours.
D.6 hours.
下列物质中,在一定条件下能与醋酸发生反应的是( )
①食盐;②乙醇;③氢氧化铜;④金属铝;⑤氧化镁;⑥碳酸钙
A.①③④⑤⑥
B.②③④⑤⑥
C.①②④⑤⑥
D.全部