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交易所交易存在的问题之一是缺乏灵活性。 ()

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每一种债券的转换因子实际上是要使具有不同票面利率和不同到期期限的债券获得同样的收益率。()

股票价格的波动率不直接影响股票期权价格()

提示：Peter给Johnson教授打电话请病假，接电话的是教授的助手 Sally。 (Peter=P；Sally=S)
P：Hello! This is Peter speaking．____51 ，please？
S：I’m sorry．Professor Johnson is not here at the moment．This is his assistant，Sally．52？
P：Yes．Please tell the professor that l’d like to ask for sick leave for tomorrow．
S：Sorry to hear that．May I ask53 with you？
P：I’m running a fever．I’ve caught a cold．
S：Oh，54 ？
P：N0，not very serious，but the doctor told me to stay in bed and have a good rest．
S：I see．I’ll55 as soon as he comes back．
P：Thank you．Goodbye!
S：Bye!
51_
53
52
55
54______
请帮忙给出每个问题的正确答案和分析，谢谢！

债券资产的价值变动应与其息票收入再投资收益率同方向变动。 ()