导致牙髓病和根尖周病的主要因素是()
A.物理刺激
B.化学刺激
C.细菌感染
D.外伤
E.免疫反应
参考答案:C
确定文教科学卫生事业单位的定员首先要考虑的是( )。
A.国家规定的定员比例
B.机构的等级
C.事业单位的业务规模
D.财政部门的供给能力
听句子,缩写原文。()
A.He finished the negotiation in three days.
B.He was on a business trip ten days ago.
C.His toughness cost him three more days.
D.His business trip lasted thirteen days.