文章介绍了逻辑加密卡sle4442工作原理及其在肺活量计上的具体应用过程，并设计了一种通用的IC卡接口电路。
This paper introduces the working principle of logic encryption card SLE4442 and its concrete application at spirometer, and also the design of a general IC card interface circuit.
方法用肺量计测定6 0 0名大学生的潮气量、肺活量、时间肺活量及每分钟通气量。
Method The tidal volume, vital capacity, time vital capacity and minute ventilation volume were observed in 600 students.
方法用肺量计测定6 0 0名大学生的潮气量、肺活量、时间肺活量及每分钟通气量。
Method The tidal volume, vital capacity, time vital capacity and minute ventilation volume were observed in 600 students.
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