资源 标记: Retort
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- 1980-01-01 The retort is one of the most efficient means of producing good quality charcoal. Wood is placed in a large steel cylinder (or "retort"). This has a tightly closed door, and some means to let tar and gases escape. The cylinder is heated from the outside. No air enters the barrel. When the wood in...
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2013-04-20 Sometimes the smallest of things can impact human health beyond all proportion to their size. Trace elements are an example of this. Trace elements in an amount that is either above or below certain thresholds in soil, animal feed, or the human diet can have important impacts on the health of...
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