5. 省譯

* Generators used in production have no bar magnets. Instead electromagnets are used.

生產(chǎn)上用的發(fā)電機不用條形磁鐵，取而代之的是電磁鐵。（省譯了 are used)

* The magnitude of the force is found to be inversely proportional to the distance between the conductors.

力的大小和導(dǎo)體間的距離成反比。（省譯了 is found)

* The alpha rays proved to be charged electrically with a positive charge.

a射線原來是帶有正電荷的。（省譯了 proved)

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