butt track ; needle trace
结果表明：节流孔板是电控共轨喷油器的重要构成部分，既控制着唢油嘴针阀的开启速度，义控制着喷油率的形状。
The results show that, as important components of electronic injector used in common rail system, orifices affect on the open rate of nozzle needle and injection rate shapes.
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