单项选择题 The output or the collector characteristics for a common base transistor amplifier shows that as a first approximation the relation between IE and IC in the active region is given by _____.

单项选择题 下列关于Word 2010打印预览的叙述中，不正确的是（）

未知题型 从输气管的流量公式中可知，减小站间管路长度，也就是在站间增建新的压气站，可以增加输气管的通过能力。It can be known from the flow formula of the gas pipeline that the passage capacity of the gas pipeline can be increased by reducing the length of the