静止龋产生的条件是由于病变环境改变使()
A.机体抵抗力增强
B.口内致龋病菌减少
C.牙齿抗酸能力增强
D.原有致龋条件消失
E.牙齿再矿化能力增强
参考答案:D
—In our English study, reading is more important than speaking, I think.
—I don't agree. Speaking is _____ reading. [ ]
A. as important as
B. so important as
C. the most important
D. more than important
在建设项目中,根据业主下达的任务和签订的合同,必须具备( )条件才可成为单位工程。
A.规模较大
B.独立施工
C.独立成本计算
D.一定量的人员