虽然本书的重点是直流测量，但是要分析噪声和仪器响应速度的问题，就需要简单地讨论一下电子电路中时间和频率的关系。
Although this handbook stresses DC measurements, an analysis of noise and instrument response speed requires a brief discussion of time and frequency relationships in electronic circuits.
因此，提高开关速度并改善正向导通电压和关断时间的折衷关系是这类器件的关键问题之一。
So, how to improve the tradeoff relationship between turn-off time and forward voltage is a key problem in power devices.
测绘了切削温度、后刀面磨损量与切削时间或切削速度的关系曲线，分析了刀具前、后刀面显微磨损、破损形貌和化学变化。
Cutting temperature, relation curves of wear with cutting time and cutting speed, microscopic features and chemical changes of rack face and rear face of the tin coated tool were measured.
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