癫痫患者,女,30岁,长期服用苯妥英钠,易并发何种口腔疾患()
A.龈缘炎
B.牙龈纤维瘤
C.青春期牙龈炎
D.妊娠期牙龈炎
E.药物性牙龈炎
参考答案:E
The Japanese guests suggested ____ their country.
A.our visiting
B.to us a visit to
C.we pay a visit to
D.all the above
银盐鉴别反应时,能不能加入过多的Na2CO3,为什么?