在孕妇和儿童身上进行的临床药理学试验属于()
A.Ⅰ期临床试验
B.Ⅱ期临床试验
C.Ⅲ期临床试验
D.Ⅳ期临床试验
E.临床前试验
参考答案:D
—Dear, you water the garden and I do the cooking.
A.Why me?
B.Forget it.
C.No way.
D.Ok, that's settled.
测定空气动力学当量直径的标准颗粒物,其密度为()
A.1
B.2
C.3
D.4
E.5