The circuit of Photoelectricity Weak Signal Detection, preamplifier circuit, difference circuit, modulation circuit, optical source thermal control and current drive circuit etc. are designed.
设计实现了基于差分后谐波检测的微弱信号处理电路、前置放大电路、差分电路、调制电路和光源温度控制电路及电流驱动电路等。
Braun notes that for people who handle only a couple of receipts a day, thermal paper is unlikely to be a major source of exposure.
布劳恩强调人们一天顶多接触很少几张打印凭据，热敏纸不可能是接触双酚A的主要来源。
Humans have been using underground thermal springs as a source of hot water for centuries - just visit an onsen resort in Japan.
数个世纪以来，人类一直在使用地热泉作为热水的一个来源-只要到日本的一个温泉度假胜地去看看就知道了。
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