?????????ж??
???????
???????????????.????????????????????????????·??,??????(??????)???????,???????????????й??,???й???????????????????,????????????,???????????.?????????????????????.?????????????,??????,??????
???????QDQ421F-25/40
?????????DN25??200mm
?????????PN2.5~4.0MPa?? JIS-10K??20K
????????-40??+80??
????????????????????
???????PC1/4
???????????70??5??
