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Astigmometr

Astigmometr (and - – otritsa. Greek stigmatos, stigma – a point + Greek metreo is frequent + – to define, measure) – the device used to definition of an astigmatism of an eye; contains two cylinder lenses different in a sign, but identical on the refracting force which rotate relatively each other.

 
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The stomach of the person not bad copes with foreign objects and without medical intervention. It is known that the gastric juice is capable to dissolve even coins.