下列除哪项外均是蒿芩清胆汤的组成药物
A.猪苓、枳实
B.青蒿、黄芩
C.陈皮、碧玉散
D.枳壳、赤茯苓
E.竹茹、半夏
参考答案:A
He's never late for class, ________? [ ]
A. is he
B. has he
C. isn't he
D. hasn't he
某校课外兴趣小组同学用氯酸钾和二氧化锰混合物加热制氧气,实验完毕后发现混合物固体质量减少了,请你用学过的化学知识解释.