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A physiotherapeutic apparatus for preventing and treating near sighted eye has a convex lens used as objective lens, lens cone, eyepiece, headgear and lens set.

一种防治视眼的理有作为物的凸透、目,还有头套和透组,用于人距离上长时间用眼时戴眼上,可以使被视物的像清楚、放大和变远。

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3G, 401(K), a,

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Bigger scopes are good for fainter objects, but are more expensive, and can be difficult to set up and use.

对观测物体较有利,不过它们也难安装与使用。

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nitromel, nitromersol, nitromesitylene, nitrometal, nitro-metals, nitrometer, nitromethane, nitro-methylaniline, nitromin, Nitromonas,

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3G, 401(K), a,
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