充填在沉积物孔隙中的矿物质将松散的颗粒粘结在一起的作用称为()作用。
A.结合
B.胶结
C.粘结
D.挤压力
参考答案:B
____ has never occurred to us that the accident can do so great harm to the family.
A.That
B.It
C.This
D.One
A.I= ,从上向下
B.I= ,从上向下
C.I= ,从下向上
D.I= ,从下向上