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The purpose of treating the cooling water of the diesel engine is to____. I、 resist the scale formation in the cooling chamber II、 lubricate the engine part III、 increase thermal capacity IV、 resist corrosion
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自1854年以来，NBER已经确认了________。
Among the basic categories of equipment, which of the following are used to convert the hydraulic energy into linear motion？
As the plunger moves upwards in the barrel, injection will commence once the plunger bas_______the spill ports and the pressure builds up.
when the fuel is provided by the supplier ,what specifications of the oil can
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