Tsis tau. Tsis txhob siv lub raj PPR rau lub cua kub. Qhov siab tshaj plaws ntawm PPR cov dej kub yeeb nkab yog 95 degrees, thiab qhov kub li 70 degrees. Yog tias koj nyob hauv ib lub xeev ntawm 70 degrees lossis siab dua 70 degrees. Lub neej ntawm PPR raj yog luv dua. Yog li, tsis txhob siv lub PPR raj xa kom sov. PB raj yog pom zoo.
Nws puas tau mus nruab 20P PR Tube?
Mar 04, 2018
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