说明：  — 上 _ _ ． 各类 电子电路 中，电阻是必不可少的重要器 1 — r件。其参数选择的是否适当，直接影响到电 路 的正常运行。特别是在处理～些要求比较 严格的模拟信号电路中，电阻的阻值更为重要。
(- _ _ On. Various types of electronic circuits, the resistance device is essential for the important 1- r pieces. Its parameters are chosen properly, a direct impact on the normal operation of the circuit. Especially in dealing with more stringent requirements-some of the analog signal circuit, the resistance of the resistance is even more important.)