基本内容 铸铁平板规格（长×宽）mm铸铁平板精度等级 1级2级3级 平面度公差（um） 200×,200102050300×,200122460300×,300122460300×,400122460400×,400122460400×,600142870500×,500142870500×,600142870500×,800163280600×,800163280600×,9001632801000×,7501836901000×,10002039961000×,120020401001000×,150024481201000×,200026521301500×,200028561401500×,250032641521500×,3000 701742000×,3000 741842000×,4000 88219