文中给出了二级脉管制冷机的基本结构尺寸以及试验结果：一级脉管达到45K；
The test results and the basic configuration of the two stage pulse tube refrigerator are presented. The first stage temperature was 45K.
在基于对西气东输管道第三方破坏主要危险源和潜在诱因详细分析的基础上，建立影响第三方破坏的5大类一级指标以及26个二级指标。
Index of 5 categories and 26 secondary indicators for third party damage based on the detailed analysis of major risk sources and potential incentives of West-East Gas pipeline is established.
该信号接收器包含第一级电路、第二级电路、电流补偿电路以及偏压电路。
The signal receiver circuit including the first stage, second stage circuit, the current compensation circuit and bias circuit.
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