该圆度仪具有成本低廉、体积小、精度适宜、可在车间生产条件下使用等优点，具有一定的实用价值。

The advantages of the instrument are:lower in cost; smaller in volume and suitable precision, and it can be used in workshops.

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本文介绍了就沈阳某厂镀银车间生产过程中产出的废挂具，根据现有的生产条件找到一种回收银，并将之生产成硝酸银的可行性方法。

According to the present product condition, a feasible method of recovering silver from silver-plating copper hanger and proparing the silver to AgNO3 was introduced.

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