无码高清视频|成人自拍视频|欧美成人午夜无码A片秀色直播|草美女视频网站|美女被操网站在线观看

單項(xiàng)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(fèi)搜題