二尖瓣狭窄的心电图表现是（）
A.心电轴左偏
B.P波高尖
C.左室高电压
D.P波>0.11秒，顶部有切迹
E.双心室电压均升高
参考答案：D
查找癌细胞的痰标本若不能及时送检，固定应选择（）。
A.10%甲醛
B.75%乙醇
C.1%甲苯
D.5%浓盐酸
E.10%冰醋酸
Not only ____________ vital for reducing fever and helping stop pain, but there are also other things that aspirin can help with.
A．has aspirin proved
B．did aspirin prove
C．aspirin proved
D．had aspirin proved
