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肥料最大效率期 maximum efficiency stage of fertilization
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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
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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.
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单选题The industrial psychologist's function differs from that of the efficiency experts in that the former _____.A
places great emphasis on maximum productionB
cares little about the increase of productionC
is mainly concerned with workers' satisfactionD
worries a lot a out those workers in poor working conditions
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单选题Which of the following statements is true concerning the overall efficiency of air compressors?（）A
High pressure compressors are more efficient than low pressure compressorsB
Mechanical efficiency divided by compressor efficiency will equal the overall efficiency of the compressor unitC
Two stage compressors are generally more efficient than single stage compressorsD
The volumetric efficiency is decreased in multistage compressors
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单选题To obtain maximum efficiency, two stage air compressors are usually （）.A
horizontally mountedB
never fitted with intake filtersC
fitted with intercoolersD
operated in an unloaded condition at all times
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名词解释题营养最大效率期
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