单项选择题

某债券为一年付息一次的息票债券，票面价值为1000元，息票利率为8%，期限为10年，当市场利率为7%时，该债券的发行价格应为（　　）元。

A.1000
B.1070
C.1076
D.1080
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单项选择题
In multipoint networks , there are tree persistence methods when a station finds a channel busy.in the 1-persistent method,after the station finds the line idle,it sends its frame immediately.this method has the （ ） chance of collision because two or more stations may find the line （ ） and send their frames immediately. In the nonpersistent method , a station that has a frame to send （请作答此空） the line . If the line is idle , it sends immediately If the line is not idle , it waits a （ ） amount of time and then senses the line again.The nonpersistent approach （ ） the chance of collision because it is unlikely that two or more stations will wait the same amount of time and retry to send simultaneously The p-persistent approach combines the advantages of the other two strategies . It reduces the chance of collision and improves efficiency.
A.overhears
B.hears
C.listens
D.senses
单项选择题
关于中位数，以下说法错误的是()
A.有时候一组样本有两个中位数
B.-组样本有一个中位数
C.通常用中位数来作为评价基金经理业绩的基准
D.中位数是上50%的分位数
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