其制备方法包括下 述操作步骤：将甲硝痤磨成粉末状，过筛；
The preparation method comprises the following operational steps: grinding metronidazole into powder, sieving;
它的由来与历史地位自不用我累述了，在网上随便搜索一下就会有一大堆的文字图片把它前前后后里里外外叙述个遍。
About its origin and status in history, I don't need to tell more here since they could be found specifically through Internet search.
如果有提述接纳或拒绝接纳要约的不可撤回承诺，必须清楚说明是否在某些情况下（例如出现较高价值的要约），该等承诺将失去约束力。
References to irrevocable commitments to accept or reject an offer must make it clear if there are circumstances in which they cease to be binding, for example, if a higher offer is made.
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