The efficiency of a flash type evaporator can be increased by()
A. lowering brine discharge density
B. decreasing the absolute pressure of each stage
C. increasing the saltwater feed heater temperature
D. increasing the pressure at the spray pipe
车间动力电气平面布线图必须标明所有用电设备的()
A. 位置
B. 编号
C. 容量
D. 计算负荷
G值试样搅拌后,用搅拌丝轻轻将混合物拨平,沿坩埚壁的层面略低()mm,以便压块将混合物压紧后,使煤样表面处于同一平面。
A. 1~2
B. 2~3
C. 1.5~2.5
D. 2.5~3.5