cc523pate 发表于 2016-2-21 18:24:38

JIS B 8317-2-1999 Vapour vacuum pumps -- Measurement of performance characterist

JIS B 8317-2-1999 Vapour vacuum pumps -- Measurement of performance characteristics -- Part 2: Measurement of critical backing pressure

admin 发表于 2016-2-22 15:01:24

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