... low speed oil protection valve；低转速机油保护阀 low speed operation；低速操作 low speed position；低速位置 ...
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low speed operation performance 低速性能
low speed operation
低速运行
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The greatest amount of exhaust emissions are produced at idle and during low-speed operation .
排气中最大量的排放物是在怠速和低速运行时产生的。
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The greatest amount of exhaust emissions are produced at idle and during low-speed operation.
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