采用机械混合法，经过在机烧结，获得型芯，并用型芯浇铸了不锈钢件。
After mechanical molding and sintering, the cores are gained and stainless steel parts are made with the cores.
采用共沉淀沉积法制备的催化剂对于二甲醚合成的活性明显高于机械混合法制备的催化剂。
The catalyst prepared by precipitation sedimentation method had a higher catalytic activity for DME synthesis than the catalyst prepared by mechanical mixing method.
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