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问题 填空题

国家统计局发布第六次全国人口普查结果，我国总人数为______人，画线部分的数写作______人，省略亿后面的尾数约为______亿人．

答案

十三亿七千零五十三万六千八百七十五写作：1370536875；

1370536875≈14亿；

故答案为：1370536875，14亿．

单项选择题

Frame Relay is simplified form of (25) , similar in principle to (26) , in which synchronous, frames of data are routed to different destinations depending on header information . Packets are routed throught one or more Virtual Circuits known as (27) . Most Virtual Circuits are (28) ,which means that the network provider sets up all DLCI connections at subscription time. (29) are also part of the Frame Relay specification . They privide a link that only lasts only as long as the session.

25（）

A．Datagram Switching

B．Datagram Routing

C．Packet Switching

D．packet Routing
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单项选择题

样本相关系数的假设检验中，备择假设为（）。

A.β=0

B.r=0

C.r≠0

D.ρ=0

E.ρ≠0
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