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齿轮传动机构装配后的跑合，是为了提高接触精度，减小噪声。()

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Which of the following conditions indicates the dilution of diesel engine lube oil by fuel

A. Water discharging from the water outlet of the lube oil purifier
B. Fuel oil discharging from the water outlet of the lube oil purifier
C. Lube oil discharging from the water outlet of the lube oil purifier
D. A change in the lube oil viscosity

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齿轮传动机构装配后的跑合，是为了提高接触精度，减小噪声。()

渐开线齿轮是最常使用的一类齿轮。()

联轴器可以在机器运转过程中随时分离或结合。()

用烙铁锡焊时其温度愈高愈好。()

Which of the following conditions indicates the dilution of diesel engine lube oil by fuel