99色精品-9色在线-99色在线-99色视频 国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

單項選擇題

Which of the following will be desirable properties of refrigerant?()
(1) non-explosive
(2) non-corrosive
(3) that it doesn’t react with lubricants

A.(1), (2) and (3)
B.(1) and (2)
C.(1) and (3)
D.(2) and (3)

微信掃碼免費搜題