The forwards and backwards movement of a reciprocating pump creates a pulsed stream that contributes sound for the chromatogram. To reduce these pulses, Each individual pump in Determine twelve.44 has two cylinders.一套高效液相色谱装置。从左至右：一台恒流输液泵将两种不同种类的溶剂按照一定比例变化梯度输送
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