Heat exchangers, other than the double concentric tube type or double tube sheet type, must employ a pressure differential and a means for monitoring the differential.
热交换器(除了双同心管换热器或双管板列管换热器)必须使用压力差,并有方法对压力差进行监控。
Due to the sample being introduced as an aerosol through the innermost concentric tube of the plasma source at a frequency of about 27 MHz, the skin effect occurs.
由于样品以气溶胶的形式通过最中间同心管引入频率为27MHz的等离子光源,出现趋肤效应。
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