题目内容

A text-book writer does not have available the material on which to base a reasonable conclusion as to who the credit(感谢) belongs.

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The use of trigonometry(三角学) to describe the electrical signal has proved very valuable for engineers.

There is found to be a radial electrostatic field (径向静电场) near the earth’s surface.

这里有许多计算机供选用。

撰写本书的目的是向读者简要介绍电子计算机。

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