CA索引包括()
A.著者索引
B.分子式索引
C.专利索引
D.属类索引
E.累积索引
参考答案:A, B, C, E
E-mail, as well as telephones, ______ an important part in daily communication.
A.is playing
B.have played
C.are playing
D.play
朱砂安神丸的药物组成有
A.玄参
B.丹参
C.黄连
D.木通
E.竹叶