Reciprocating vacuum pump, oil-free vacuum pump 1 cylinder 1.1 Measure the roundness and cylindricity of the cylinder, and determine the cylinder or replace it according to the degree of wear. 1.2 The roundness and cylindricity of the cylinder are in accordance with Table 5. Cylinder diameter

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According to foreign media reports, Google and LG will launch a high-resolution head-mounted display during the Display Week 2018 trade show in late May. The head-up display is a 4.3-inch OLED screen with 18 million pixels and a pixel density of 1443ppi. It has a wide fiel

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