Time Events 1. In the 1830s a. first radio program broadcasting 2. On Aug. 5th, 1858 b. two coasts of the U.S. shown on TV at the same time

Words and Phrases Listen to some predictions some people have made about the business world in the next 20 years or so. Add missing words to the following statements. Tape 1. There’ll be no more ___________, and businesses will only use ________________

Words and Phrases Direction: you are going to hear some of track and field world records. Complete the Chart. Pay special attention to the country and the records. Events

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一、圆盘旋光仪的构造 二、旋光仪主要由起偏振

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例1求以下函数的象函数 (1)单位阶跃函数 (2)单位冲击函数 (3)指数函数

网络函数.电路在单一的独立激励下 其零状态r(t)响应的象函数与激励e(t)的象 数之比