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单项选择题

金融工具其实就是一个合约，很容易在公开交易市场上找到市场价格。
A、正确
B、错误

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多项选择题In the closing paragraph of an application letter, you can ___________.

A．request information or an interview politely
B．indicate what supplementary material is being sent as enclosure
C．thank the reader for his/her consideration
D．express your expectations of being replied

单项选择题电流型逆变电路不需要给开关器件反并联二极管来提供反馈无功能量的通道。 A、正确 B、错误