本文分析了电视机检波电路的原理，从理论上说明了伴音第一中频应吸收的强度，以使图象不受伴音干扰。
This article analyses the principle of detecting circuit in TV receiver. and explains theoretically the correct absorption of first sound IF so as to keep the sound from interfering the picture.
第一册讨论船舶在其更加基础的理论上的几何学和测量方法，也包括安全问题，结构强度，下水，调配载重及稳定性。
Volume 1 discusses ship geometry and measurement in its more basic concepts, also covering safety issues, structural strength, flotation, trim and stability.
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