阻止精子流入宫腔的避孕方法为()。
A.使用避孕套
B.放置宫内节育器
C.运用安全期
D.口服长效避孕药
E.口服短效避孕药
参考答案:A
___________lessons were not difficult.
A.Our few first short English
B.Our first few short English
C.Our few first English short
D.Few our first English short
脾切除术的年龄限制为
A.大于2岁
B.大于4岁
C.大于6岁
D.青春期以后
E.没有限制