I'm tired. Let's stop _ a break. [ ]
A. have
B. to have
C. having
D. has
答案:B
若诊断临床糖尿病,应选择下述哪项检查()
A.尿糖
B.空腹血糖
C.糖化血红蛋白
D.口服糖耐量试验
E.空腹胰岛素测定
10PPm是指一百万份气体总体积中,该气体所占的体积分数为()。
A.10
B.100
C.1000
D.10000