矿山压力来源于上覆岩层的（）和地质构造的残余应力。
参考答案：重力作用
The girl is _____ beautiful ____ she may become a film star when she grows up.
A．too; to
B．such; that
C．so; that
D．so; to
油泵与原动机之间应有较高的同轴度，倾斜角不得大于（）.
A.30＂
B.1°
C.30＇
D.1°30＂
