下列避孕方法中哪项最不可靠
A.避孕套
B. * * 隔膜
C.短效避孕药
D.宫内节育器
E.安全期避孕
参考答案:E
This is the first time that I ______ at the meeting.
A.had spoken
B.have spoken
C.has speaking
D.was speaking
胃阴亏虚型胃痛,其临床主要特征为
A.胃脘隐隐胀痛
B.胃脘隐隐灼痛
C.胃脘灼热胀痛
D.胃脘胀满而痛