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Which of the following components are used to convert alternating current produced in the
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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
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.
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