牙颈部脱敏最好用()
A.碘化银法
B.氨硝酸银法
C.氟化钠法
D.碘酚法
E.离子导入法
参考答案:C
客服主管每日巡查不少于小区楼道总数的()
A.10%
B.7%
C.5%
D.3%
You'd better tell your friends the of smoking. [ ]
A. dangers
B. dangerous
C. dangered