俺来也色色-精品国产4P一区二区-裸体自慰写真-久久国产精品77777-一本之道DVD不卡视频-92成人-亚洲免费A片-伊人狼人在线视频-三级免费播放器-理论片国产+欧美,学习成人A片,J大大奶,黑人借宿NTR中文字幕

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