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问题 单项选择题 案例分析题

已知某边坡为均质土坡，坡体土质的内聚力为c=20kPa，内摩擦角为φ=25°，重度为19kN/m3。

如边坡挖方高度为12m，其坡角宜为（）。

A.55°

B.63°

C.70°

D.75°

答案

参考答案：B

单项选择题

单元测试时所编写的测试模块分为______。

A．驱动模块与桩模块
B．上级模块与下级模块
C．主程序与子程序
D．测试模块与被测试模块
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单项选择题

IPv6 is short for "Internet Protocol Version 6". IPv6 is the "next generation" protocol designed by the IETF to ( 71 ) the current version Internet Protocol,IP Version 4("IPv4").
Most of today’s Internet uses IPv4, which is now more than twenty years old． IPv4 has been (72) resilient in spite of its age, but it is beginning to have problems. Most importantly, there is a growing ( 73 ) Of IPv4 addresses，which are needed by all new machines added to the Internet.IPv6 fixes a number of problems in IPv4，such as the (74) number of available IPv4 addresses. It also adds many improvements to IPv4 in areas such as routing and network autoconfiguration.IPv6 is expected to gradually replace IPv4，with the two coexisting for a number of years during a transition (75) .

A．restrict

B．confine

C．1imited

D．imprison
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