题目内容

一台异步电动机铭牌数据中额定转速为975r/min,则此电动机的磁极数是()极。

A. 6
B. 3
C. 4
D. 8

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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?

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

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。

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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