A.828B.720C.540D.432
A.展厅喷头的安装高度为6mB.某展柜面积500m2,共设置7个喷头,安装高度小于1.5mC.喷头的安装高度距顶板0.3mD.喷头按正方形均匀布置
A.20B.25C.30D.35