... buttom sampling tube 底质柱状取样器 vacuum sampling tube 真空取样器 carbotrap300 sampling tube Carbotrap300采样管 ...
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It is necessary to solve openning-tube sampling problem for the mass-spectrometer analysis of residual gases in sealed vacuum devices.
密封真空器件内残气的质谱分析，必须解决开管取样技术问题。
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