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【单选题】
计算申报价格上下限时，如果交易标的上一交易日不存在有效综合价格，选取交易标的（）A.
当日开盘价
B.
首日指导价
C.
上一交易日最后一笔成交价
D.
历史交易日中最新的有效综合价格
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反馈参考答案：
举一反三
【简答题】Tom, an 11-year-old boy, was ill. He had got a cough, and his mother was worried and took him to see a doctor. The doctor looked over Tom carefully and said, “Tom, nothing serious.” Then he gave him s...
【简答题】阅读理解 Tom, an 11-year-old boy, was ill. He had got a cough, and his mother was worried and took him to see a doctor. The doctor looked over Tom carefully and said, 'Tom, nothing serious.' Then he gave ...
【简答题】Listen to the recording and complete the following sentences. 1 The ___1___ will be fine for the next ___2___ days. Then, on ___3___, ___4___ 'll be some rain in the ___5___. The ___6___ will be dry a...
【简答题】He was then 14 years old, a rather late age ____________ to start a formal education.
【多选题】关于受激辐射，下列说法正确的有：
A.
通过受激辐射产生的光子具有相同的状态
B.
粒子在两能级间跃迁发生受激辐射的速率与上能级的粒子数呈正比
C.
受激辐射与受激吸收是相反的物理过程
D.
普通光源里不存在受激辐射
E.
激光光源里不存在自发辐射，只存在受激辐射
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