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蔗糖属于非还原性糖。但是,当蔗糖与 Bendict 试剂长时间共热时也会发生阳性反应。试解释之?
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【单选题】Choose the best answer to complete the paragraph. My friend and I are planning a trip to Brazil. We're going to save money by staying in ________ and camping on the beach. I hope we have nice ____! We...
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