????:1??????loft????:??????????

2?????600

3????????

4??????????

5???????

????????????????11??23??????????(????? ??????)11??23???????????????????,“??????????????”?,????

??????????????????????? ????

???,??,???????????????????????????????????????????????????????????????????????????????????????????????????30???????????????????????80????????,??,?????

????,????????????????????????????????;??????,??????????????????«GB/T23776????»????????????,??5???????5?????????

?????????????????? ??

??,????????????,???????????,????(????)???????,???????????????,????????

????,????????,???????????,??????????????????????????????,?????????????????????????????????????????????????????

??????,???????????????“??”??????????,????,???????,?????????«????»«???????????????????????????»«?????»??????????????????

??????????????? ????

“???????????????,?????????????”??????,??????,???????????????,????????,?????????????????;?????????????????,??,????????

????,??,??????“??”?,??????,“???????”?????“?????????”????????????39.2??????????,????120????,???????2??,90%????,75%???“??????”???????????54.76????,???????????????????????????(??)

????:????????