决定牙周炎进展和结局的主要因素是
A.细菌微生物
B.食物因素
C.宿主因素
D.时间因素
E.环境因素
参考答案:C
—Did he say anything that appealed ________ you especially?
—Not really. Actually I slept halfway through his speech.
药物、农药、酒精现场救护原则是什么?