I have been told that the new law will come into ______ on January 1st next year. [ ]

A. effect      

B. use            

C. service        

D. existence

车间及试（实）验室的插座安装高度距地面不小于（）；特殊场所暗装的插座安装高度距地面不小于（）；同一室内插座安装高度一致。

A.0.3m，0.15m

B.0.2m，0.15m

C.0.3m，0.25m

D.0.2m，0.25m