It is still under discussion _____ the old bus station should be replaced with a modern hotel or not. [ ]

A. whether

B. when

C. which

D. where

刷辫、刷握连接牢固，电刷在刷握中上下灵活，间隙不大于0.3mm，电刷接触面积不少于（）。

A、75％

B、70％

C、75.5％