肥料最大效率期 maximum efficiency stage of fertilization
肥料最大效率期 maximum efficiency stage of fertilization
相关考题：
在植物生长发育中有一个时期，植物需要养分的绝对数量最多，吸收速率最快，肥料的作用最大，增产效率最高，此时期称为（）。A、植物营养的阶段性B、植物营养最大效率期C、植物的营养临界期D、植物营养的选择性
最大指示空速用海里/时表示.（）A、The maximum instruction airspeeds are shown in nm per hour.B、The maximum indicated airspeeds are shown in nm per hour.C、The maximum instruction airspeeds are shown in knots.D、The maximum indicated airspeeds are shown in knots.
单选题The industrial psychologist's function differs from that of the efficiency experts in that the former _____.Aplaces great emphasis on maximum productionBcares little about the increase of productionCis mainly concerned with workers' satisfactionDworries a lot a out those workers in poor working conditions
单选题Which of the following statements is true concerning the overall efficiency of air compressors?（）AHigh pressure compressors are more efficient than low pressure compressorsBMechanical efficiency divided by compressor efficiency will equal the overall efficiency of the compressor unitCTwo stage compressors are generally more efficient than single stage compressorsDThe volumetric efficiency is decreased in multistage compressors
单选题To obtain maximum efficiency, two stage air compressors are usually （）.Ahorizontally mountedBnever fitted with intake filtersCfitted with intercoolersDoperated in an unloaded condition at all times
名词解释题营养最大效率期