肥料最大效率期 maximum efficiency stage of fertilization
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经济效率（Economic efficiency）
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2、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
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3、诊断效率(efficiency of diagnosis)
诊断效率(efficiency of diagnosis)
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4、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
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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%
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养分效率 nutrient efficiency