_______for us to discuss the problem again.It has already been settled.[      ]

A. It has no doubt  

B. There has no doubt

C. It is no need  

D. There is noneed

龙门刨床采用（）进行床身的安装与调整。

A.水准仪

B.经纬仪

C.水平仪

D.水平尺