上市后药品临床再评价阶段中,常见病的试验样本数应不少于
A.50例B.100例C.300例D.1000例E.2000例
参考答案:E
. Mary had taken _____ to see that her guests had everything that they could possibly want.
A.efforts
B.pains
C.attempts
D.endeavors
我国的地产市场是土地所有权的出让市场。 ( )