《储蓄国债（电子式）质押管理暂行办法》规定，以储蓄国债为质押品取得贷款仅限在试点银行

牙菌斑成熟的时间大约是

A．12小时

B．48小时

C．3～9天

D．10～30天

E．30天以上

所给词的适当形式填空。

1. My mother can't sleep well, and sometimes she even stays _____ (wake) the whole night.

2. Be careful to cross the street when we meet heavy _____ (traffic).

3. _____ (polite), he drove the old man out of the room and shouted at him angrily.

4. They expected that they could solve the problem by _____ (they).

5. _____ (thousand) of students rushed out to celebrate their victory (胜利).

在形成安氏Ⅱ类Ⅰ分类错的骨骼因素中，下列哪项是主要因素（）

A.上颌前突

B.上颌后缩

C.上颌前突，下颌后缩

D.下颌后缩

E.下颌后缩

据有关资料显示，球形石灰石分解速度比圆柱形料块快50%，比片状石灰石快（）倍。

A、5

B、4

C、3.5

D、2

核心边缘理论是一种关于( )的理论。

A．城市空间相互作用和扩散
B．城市规模分布
C．城市产业结构调整
D．城市职能研究