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-- Hi, John Carter from APU. Is Diane there -- I’m ______ she’s in a meeting.
A.afraidB.appologizeC.not sure
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听力原文:M: I’mfrid I must be going now.W: Must you It’s still erly.M: I’mfrid I r听力原
听力原文:M: I’mfrid I must be going now.W: Must you It’s still erly.M: I’mfrid I r听力原文:M: I’mfrid I must be going now. W: Must you It’s still erly. M: I’mfrid I relly must. I hve to meet midnight plne. W: In tht cse, we cn’ t keep you. M: Well, thnk you very much for plesnt evening. W: Thnk you for coming. You must comegin. M: Thnk you. I will. Good-bye. W: Good-bye. I wish you very good journey home. Why does the mn leve erly Becuse he is too tired. B.Becuse he is ctching flight. C.Becuse he does not like to sty.A.Because he is too tireDB.Because he is catching a flight.C.Because he does not like to stay.
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维生素C又名抗坏血酸,化学式为C6H806,可溶于水,主要存在于蔬菜和水果中,它能增强人体对疾病的抵抗能力.()若配制质量分数为10%的维生素C注射液100g,需水的质量为______g.
答案:
(1)含碳的化合物(除碳的氧化物、碳酸、碳酸盐外)称有机物,所以维生素C属于有机物. (2)要证明维生素C中含有碳元素,...
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