陈皮的主要药理作用是()
A.利胆作用
B.抑制子宫
C.助消化
D.祛痰平喘
E.抗肿瘤
参考答案:A, B, C, D
Max has to return the walkman to Jim today because he _____ it for two weeks. [ ]
A. has borrowed
B. has had
C. has kept
D. has bought
在FeO、Fe2O3、Fe3O4三种化合物中,与等质量铁元素结合的氧元素的质量比为( )
A.6:9:8
B.12:8:9
C.2:3:6
D.1:3:4