69精品久久久久久久精品a片,人人妻人人澡人人爽人人精品,少妇荡乳情欲办公室456视频,国产精久久一区二区三区

Chlorodifluoromethane

R22 is a colorless and approximately odorless gas at room temperature, and can be liquefied into a colorless and transparent liquid under pressure. Non combustible, non explosive, non corrosive, slightly more toxic than R12, but still a safe refrigerant. R22 has high chemical and thermal stability, especially in the absence of water, and does not react with general metals below 200 ℃. In the prese