根据《医疗机构药品集中采购工作规范》的规定,对申报药品实行综合评价时,质量要素实际权重一般不应当低于总分的()。
A.20%
B.25%
C.30%
D.50%
参考答案:D
The story book _________ for two weeks .
A.has been borrowed
B.has borrowed
C.has been kept
D.has kept
空气中,氮气的体积分数约为
A.0.03%
B.0.94%
C.21%
D.78%