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计算题：已知直径为0.34mm的导线，原长度为300mm，伸长率为15%求拉断后的长度？

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GB/T2539规定，测定石蜡熔点时重复测定两个结果之间最大差值不得超过（）℃。

A. 0.01
B. 0.05
C. 0.1
D. 0.5

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挖台阶宽度、高度应符合设计要求，沿线路纵向挖台阶的宽度不应小于（）m。

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An organization called contoso.com has Exchange Server 2010.@contoso.com e-mail address suffix. Anonymous and Authorization user can post to a Public Folder named Folder1 by sending e-mail messages to folder1@contoso.com.You need to prevent all users from posting content to folder 1， by sending e-mail.How should you do this？（）

A. Default receive connector
B. Public folder management console
Creating Transport Protection Rules
D. In Exchange Management Console， modify properties of Public Folder database.

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圆线同心绞，当中心绞层单线根数为4根时，再绞2层，其单线总根数为（）根。

A. 27
B. 28
C. 29
D. 30

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