4399在线视频免费观看

環(huan)境工(gong)(gong)程、工(gong)(gong)業清洗工(gong)(gong)程、鍋爐工(gong)(gong)程、水處理(li)工(gong)(gong)程的(de)施(shi)工(gong)(gong)、維(wei)修(xiu)、調試；水處理(li)藥(yao)劑(ji)、工(gong)(gong)業清洗劑(ji)的(de)研(yan)發、銷(xiao)售(shou)(shou)；水處理(li)檢測(ce)儀器的(de)銷(xiao)售(shou)(shou)、維(wei)修(xiu)；水處理(li)化學(xue)試劑(ji)的(de)銷(xiao)售(shou)(shou)（不(bu)含危險化學(xue)品）；環(huan)境檢測(ce)；食品檢測(ce)；防水防腐蝕保(bao)溫工(gong)(gong)程的(de)施(shi)工(gong)(gong)；中(zhong)(zhong)央空調系統設計、安裝；中(zhong)(zhong)央空調清洗、檢測(ce)、維(wei)保(bao)；空調主機及附件的(de)銷(xiao)售(shou)(shou)。（依法(fa)須經(jing)批準的(de)項目，經(jing)相關部門批準后方可開展經(jing)營活動）