正常小儿20个乳牙出齐的年龄是2岁。
参考答案:错
It's time _____ school. [ ]
A. go to
B. go
C. to go
D. to go to
阴肿的病因病机包括 ()
A.湿毒蕴结
B.外伤
C.肝经湿热
D.阴虚挟湿
E.肝肾阴虚