leaky pem teb tuaj yeem muab faib ua ntau hom raws li cov khoom sib txawv, Tam sim no, viav vias txheej yog siv dav hauv cov ntaub ntawv hauv qab no: cov qhob pob zeb tiv thaiv / phaj / steel ntaub npuag / steel welded ntaub / yas phaj / ceramic phaj, thiab lwm yam
