A.There are too many students in the discussion. B.Some people don't let other people talk. C.Questions to discuss are too easy. D.She doesn't have time to prepare the discussion.
【简答题】某场地如图 1.45 ( 教材 37页 ),( 1 )试按挖、填方平衡的原则确定场地平整的计划标高 H 0 ,然后算出方格角点的施工高度,绘出零线,分别计算挖方量和填方量; ( 2 )当 i y =0,i x =3‰ 时,试确定方格角点的计划标高; ( 3 )当 i y =2‰,i x =3‰ 时,试确定方格角点的计划标高。