Information is no good to you if you can't（）it.The location dimension of information means having access to information no matter where you are.

A.access

B.make

C.learn

D.bring

一对齿轮啮合时，两齿轮始终相切的圆是（）

A.分度圆

B.基圆

C.节圆

D.齿根圆