问题描述：
英语翻译
An alkalin solution of copper salt was subjected to hot reduction by direct titration of a protein-free solution,in the presence of methylene blue,without inversion.Total sugar was determined after inversion with concentrated hydrochloric acid.
An alkalin solution of copper salt was subjected to hot reduction by direct titration of a protein-free solution,in the presence of methylene blue,without inversion.Total sugar was determined after inversion with concentrated hydrochloric acid.
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