两网孔电流以相同方向流过公共电阻时,网孔的互电阻取负号,当两网孔电流以相反方向流过公共电阻时互电阻取正号。
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回路电流法是网孔电流法的扩展应用。
A. 对
B. 错
Printing is known as “mother of civilisation”. It has a long history and includesblock printing and _________ printing.
A. movable type
B. color printing
Li Shizhen of the Ming Dynasty, whose monumental masterpiece, Compendium ofMeteria Medica, includes 1.892 medicinal substances, 11.096 prescriptions,and 1,162 illustrations. _________ years earlier than the next pharmacopeia in the world, this book has been translated into various languages and circulated throughout many countries.
A. Six hundred and thirty-five
B. Eight hundred and thirty-five