In a flash evaporator, scale as a result of higher than normal temperatures in most likely to occur in the ()
A. second stage feed heater
B. saltwater feed heater
C. distillate cooler
D. second stage vapor separator
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自然界不同的铁矿石其还原性也不同,()矿最难还原,赤铁矿次之,褐铁矿最易还原。
AutoCAD2009中包含了的线型定义文件有()。
A. acalin
B. system.lin
C. acadiso.lin
D. ccli