A.1/10~1/15B.1/12~1/15C.1/18~1/20D.1/25~1/30
A.機(jī)械化問(wèn)題B.模板問(wèn)題C.澆筑混凝土問(wèn)題D.程序化問(wèn)題
A.10B.15C.20D.25