口服避孕药的作用机制有()
A.改变子宫颈黏液性状
B.抑制卵泡生长、发育
C.阻止受精卵相遇
D.改变子宫内膜形态和功能
E.阻碍着床
参考答案:A, B, D, E
______, none of these reference books was useful.[ ]
A. Relevantly
B. Gradually
C. Unfortunately
D. Punctually
运动性失语症