Plant growth regulators have no effect on tobacco’s leaf number significantly.
植物生长调节剂对烟草植株有效叶片数没有显著的影响。
参考来源 - 打顶和生长调节剂对烟草生长及钾素营养的影响The calculating result showed that impeller outlet diameter D2 effects on the head largest of these parameters,vane outlet angle β2 smallest,inlet diameter D1,outlet width b2,vane number Z and vane length ratio R were between them successively.
计算结果表明,在这些几何参数中,叶轮出口直径D2对扬程影响最大,叶片出口角2β影响最小,进口直径D1,叶轮出口宽度b2,叶片数Z和叶片长度比R依次地处于它们之间。
参考来源 - 低比转速泵几何参数对扬程综合影响的灰色理论分析·2,447,543篇论文数据，部分数据来源于NoteExpress
分析了叶片数、叶片局部加厚、上冠下环厚度等因素对转轮强度性能的影响。
The factors of effecting runner intensity performance such as the blades number, local thickness of crown and band are analyzed.
阐明了动静叶片数的匹配及其轴向间距的配置在轴流通风机气动设计与结构设计中占有重要位置。
It is the main points that rotor and stator blades matching and the axial distance disposition in pneumatic and structural design for axial fan.
而旋翼桨叶片数的选择，对轻型和中型直升机来讲，4片桨叶旋翼和5片桨叶旋翼具有典型意义。
As to the selection of rotor blade number for light and medium helicopter, 4 blade and 5 blade rotor are typical.
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