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用烙铁锡焊时其温度愈高愈好。()

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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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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

金属材料都能进行矫正和弯形。()

代号为6303的轴承内径为15mm。()

轴承是用来支承轴的部件，也可用来支承轴上的移动零件。()