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

The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated ()

A.for atomizing
B.for centrifuging
C.in a storage tank
D.in the re-circulating line

微信掃碼免費搜題