【正文】
項工作需要兩個人。 ?We could apply these two vectors, which it will be noticed are in polar form, to any work characteristic. 我們可以把這兩種矢量應(yīng)用于任何網(wǎng)絡(luò)特性,而讀者會注意到,這兩種矢量均為極坐標(biāo)形式。插入語位置不定,位于句首或主語之后較為常見。 Now consider a character consisting of 8 information bit plus 4 control bits. 7. PCM是用以將模擬信號轉(zhuǎn)換成數(shù)字信號的一種重要方法。 By far the most popular serial interface between a puter and its CRT terminal is the asynchronous serial interface, and between a circuit switch and its telephone terminal, the synchronous one. 5. 由發(fā)送器所送出的停止位總是被設(shè)置成信號電平。 No (None of) start bits are placed in the mark level. 3. 我們將字符的起始位設(shè)置成空號電平,而將字符的終止位設(shè)置成信號電平。 1. 字符中的比特位并非全部用于表示數(shù)據(jù)。 6. 現(xiàn)在我們來考慮一個包含 12比特的字符。 4. 在計算機(jī)與其顯示終端之間最為常見的串行接口是異步串行接口,而在程控交換機(jī)與其電話終端之間最為常見的串行接口是同步串行接口。 2. 所有起始位都不被設(shè)定為信號電平。 ?分詞短語作定語,位于所修飾名詞之后。 并列復(fù)合句中的省略: 在并列復(fù)合句中,后一復(fù)合句中與前一復(fù)合句相重復(fù)的部分可以省略。 ?Both the transistors on the table are not good. 桌子上兩個晶體管并不都是好的。 ?All the data are not to be checked. ? None of the data are to be checked. 所有的數(shù)據(jù)都不核對。 ? Instruments here are not good. 這里的儀器并非都是好的。 The repetition rate of 8digits per sample value is higher than that of 4digits. 8. 話音信號是一個模擬信號,通過采樣、量化和編碼,我們可以實現(xiàn)話音信號的數(shù)字傳輸。 The problem of coding is a very important one. 6. PCM這個術(shù)語是一個通信術(shù)語。 The speech signal of maximum frequency has been represented by a signal of frequency 64 kHz, a fact that we learned yesterday. 4. 編碼器是將采樣幅值轉(zhuǎn)換成一組脈沖的單元,它對數(shù)字傳輸是非常重要的。 It is digital transmission that provides a powerful method for overing the noisy environment. 2. 數(shù)字傳輸正是為克服這種噪聲環(huán)境提供了一種有力的方法。 8. 話音信號是一個模擬信號,通過采樣、量化和編碼,我們可以實現(xiàn)話音信號的數(shù)字傳輸。 6. PCM這個術(shù)語是一個通信術(shù)語。 4. 編碼器是將采樣幅值轉(zhuǎn)換成一組脈沖的單元,它對數(shù)字傳輸是非常重要的。 2. 數(shù)字傳輸正是對于克服這種噪聲環(huán)境提供了一種有力的方法。 * It is ? that (which, when, who) ? 強(qiáng)調(diào)句型,如 * It is the document that is very important. It was Faraday who first discovered electromagic induction. known as the signaltonoise ratio 過去分詞短語作后置定語 ,常見,譯為 稱之為 ? 。 * 被省略的邏輯主語多數(shù)情況下指的是主句的主語或逗號前整個句子的含義,點(diǎn)也有少數(shù)列外。 * A working equation expresses the unknown quantity in terms of the known ones. * These equations are called differential equations, and now their study forms one of the most challenging branches of mathematics. * We shall see how a speech channel be con