Хлор и его применение
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![С закатом Европы по прежнему без перемен [Настал тёмный век?]](https://sun9-71.userapi.com/mM2XfzTqT8O-NQ0xEyH5qrNNW7BwOOxIqlR7tQ/a-1tY85tujA.jpg)
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