云南地处高原，发动机充气效率下降，而且液化石油气装置与发动机不匹配，缺乏必要的高原调整技术方案。
Yunnan locate in plateau, engine inflate efficiency drop, liquefied petroleum gas device and engine mismatch, lack the essential plateau and adjust the technological scheme.
压力损失使发动机的排气背压升高，引起充气效率下降；
The pressure loss caused the increase in exhaust back pressure, leading to the decrease in charge efficiency.
压力损失使发动机的排气背压升高 ，引起充气效率下降 ；
The pressure loss caused the increase in exhaust back pressure, leading tot…
压力损失使发动机的排气背压升高 ，引起充气效率下降 ；
The pressure loss caused the increase in exhaust back pressure, leading tot…
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