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(xiàng)選擇題

What is one effect of running a diesel engine at too cool a temperature? ()

A.Buildup of sludge in the lubricating system
B.Excessive fuel consumption
C.Severe heat stresses on mechanical parts
D.Foaming of the lubricating oil

微信掃碼免費(fèi)搜題