... excess sound pressure 峰值声压 excess speed test 超速试验 excess steam 旁路蒸汽，多余蒸汽 ...
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Test results show that fluctuation of torque output and engine speed, HC emission and its rise ratio are all affected by excess air ratio.
研究结果表明：扭矩波动、转速波动、HC排放值和HC升高率都受空燃比的影响，并且它们的变化趋势具有较好的一致性；
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