Automatic stabilizers are government programs that tend to: （）

A. automatically increase tax collections during a recession.

B. reduce interest rates, thus stimulating aggregate demand.

C. change government deficits in a manner counter-cyclical to economic growth without legislative action.

用砂布对工件进行修整抛光，达到较好的表面粗糙度时，可选用（）号的砂布进行抛光。

A．2

B．1/2

C．1

D．00或0