提供产生牙齿矫治力的基础是（）。
A.基牙
B.牙槽骨
C.口腔黏膜
D.支抗
E.矫治力
参考答案：D
She doesn’t plan her days. She watches TV ______ evening and changes channels ______ few minutes. So for her this summer just means another boring vocation.
A．in; every
B．every; every
C．every; each
D．every; in
对结构表面隐蔽的模板，在验算模板及其支架的刚度时，其最大变形值为为模板构件计算跨度的( )。
A．1/400 B．1/1000C．1/800 D．1/250
