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Which of the following statements is true concerning any evaporator?（）
A. High conductivity of the distillate indicates distillate salinity is excessive
B. Increasing the absolute pressure of the shell will increase the distillers capacity
C. Mesh separators are used in evaporators to filter the distillate
D. Reducing the brine density will reduce the heat lost overboard
如果是换货的，旧品可与新品一起开在一张销货凭证上，一张销货凭证可以是多件旧品或多件旧品加一件新品，但不可以一件旧品对应（）件新品。
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