装配式墩台安装时，墩台柱式构件基座槽洞四周与柱边的空隙率不得小于( )。

A．10mm

B．20mm

C．30mm

D．40mm

Your essay is quite good: just _____ it _____ with a few illustrations and quotations.

A．put .. up

B．touch .. up

C．cut .. out

D．write .. off