单项选择题
The advantages of flash type evaporators, as compared to submerged tube type evaporators, include （）.
A.less internal corrosion because of lower brine density B.higher temperature evaporation for lower salinity of the distillate produced C.less scale formation in a flash evaporator D.less feed-water required for a flash evaporator
单项选择题 The （）is used to burn oil sludge.
单项选择题 Which is the pollution prevention equipment?（）
单项选择题 Sludge may form in the lubricating oil crankcase of a reciprocating air conditioning compressor as a result of （）.
