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hydroquinone造句
31. OBJECTIVE : To establish a HPLC method for the determination of hydroquinone in compound hydroquinone cream.
32. The wholly aromatic four-component copolyesters were prepared from p-acetoxy-benzoic acid, hydroquinone diacetate, 2,6-naphthalene dicarboxylic acid and isophthalic acid by melting polycondensation.
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