窝沟封闭操作方法不需
A.冲洗、干燥
B.酸蚀
C.清洁牙面
D.粘结剂
E.涂布封闭剂,光照
参考答案:D
Software()activities consume a large portion of the total life-cycle budget.
A.repair
B.maintenance
C.change
D.update
国内咯血最常见的病因是()
A.流行性出血热
B.肺结核
C.肺炎
D.支气管肺癌
E.支气管扩张