工厂的最小有效规模（Minimum efficient size of pl

1、The efficiency of a flash type evapora

The efficiency of a flash type evaporator can be increased by（）Alowering brine discharge densityBdecreasing the absolute pressure of each stageCincreasing the saltwater feed heater temperatureDincreasing the pressure at the spray pipe

2、诊断效率(efficiency of　diagnosis)

诊断效率(efficiency of　diagnosis)

3、The mechanical efficiency of an engine

The mechanical efficiency of an engine is always less than 100% （） losses occurring in the form friction.AbecauseBsinceCdue toDowing to

4、What happens to the efficiency of an a

What happens to the efficiency of an anchor when it is moved from sand to mud?（）AThe efficiency increasesBThe efficiency decreasesCThe efficiency remains the sameDThe efficiency cannot be determined.

5、The mechanical efficiency of an engine

The mechanical efficiency of an engine （） because losses occur in the form of friction.Ais always less than 100%Bis always more than 100%Cis always equal to 90%Dis always less than 90%

6、肥料最大效率期 maximum efficiency stage of fe

肥料最大效率期 maximum efficiency stage of fertilization