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At present, the temperature is gradually rising, greenhouse vegetables are beginning
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2. Engine cylinder head lost mold cast iron parts installed bench test through mechanical p
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Fluoroplastic alloy centrifugal pump FSB (D) series can be long-term delivery of any concentra
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〠Abstract 】 In this paper, the properties of W18Cr4 V steel
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Abstract: The high pressure valve used in the well control device has high
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Abstract This paper describes the method of data exchange between Visual Foxpro 3.0