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【单选题】
2015 年 9 月 10 日,某企业与客户签订销售合同并预收货款 55000 元, 9 月 20 日商品发出, 增值税专用发票上注明价款为 50000 元,增值税额为 8500 元,当月发出商品的同时收到货款,该企业应 确认的商品销售收入金额为( )元。A.
50000
B.
3500
C.
58500
D.
55000
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【简答题】某种四肽α-COOHpK=2.4,α-N + H 3 pK=9.8,侧链-N + H 3 pK=10.6,侧链-COOHpK=4.2,试计算此种多肽的等电点(pI)是多少?
【简答题】在大气污染中我们可以根据 、 、爬升型、 、漫烟型五种烟羽形状了 解大气稳定状况。
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【单选题】听力原文：M: Mary worked as a secretary for three years. Then she became a reporter. After that she began teaching in a high school. W: I know. And she has been doing nothing else ever since. Q: What is Ma...
A.
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B.
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C.
Teacher.
D.
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【简答题】1.Aspirin is a but highly ______treatment. 2. Light clothes are _______ in
keeping cool in warm weather. 3. Mary turned out to be an secretary. 4. As we get older, our bodies
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