There is something wrong with our radar．All kinds of objects can’t be clearly（）within the definite range. ["Shown","Expressed","Appeared","Displayed"]
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？
试述苏轼对词的改革及其意义。
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"]
什么是熟料折合比？它对生产有什么影响？
