The demisters installed in a flash-type evaporator serve to （） ["deaerate the first effect distillate","filter the condensed flash vapors","deaerate the first and second effect distillate","remove small water droplets entrained in the flashed vapor"]
机组主蒸汽参数降低为什么会影响其热经济性？
干法纺丝时热风的送风方式是哪些？
A vacuum is initially established in the first and second stages of a low pressure evaporator by the use of （） ["vacuum drag from the auxiliary condensate system","individual vacuum pumps","a single non-condensing air ejector","a two stage air ejector"]
办理项目档案移交手续时，要明确档案移交的下面哪些要点（）。 ["移交的内容","案卷数","图纸张数","移交人签名"]
纤维后加工中干燥致密化的条件是什么？
