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路堑开挖到设计标高时，应进行检测。设计为200km/h时，基床范围内不得夹有比贯入阻力Ps＜1.5MP或基本承载力σ0＜（）的土层；当设计速度为160km/h时，Ⅰ级铁路基床范围内不得夹有比贯入阻力Ps＜1.2Ma或基本承载力σ0＜（）的土层。

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ZYJ7-220/1800电液转辙机动作时间不大于（）。

A. 8s
B. 12.5s
C. 17.5s
D. 24s

You work as the enterprise exchange administrator at Company.com.The Company.com network consists of a single Active Directory domain named Company.com.Company.com has an Exchange Server 2010 organization.Company.com contains an edge transport server named - sr10 that is configured as an open smtp relay.one of the Company.com managers complained that he cannot get any e-mail from a customer the stanford.com domain name.you have received instructions from the cio to make sure that -sr10 can receive the e-mails from stanford.com. What should you do？（）

A. The best option to set up an address rewrite entry.
B. The best option to set up an IP Allow List entry.
C. The best option to set up the properties of the sender filtering feature.
D. The best option to set up the properties of the Sender ID feature.

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简述钻井液的主要作用？

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以下关于电梯机房说法有误的一项是（）。

A. 机房必须设在电梯井道的顶部
B. 机房的平面和剖面尺寸均应满足布置机械及电控设备的需要
C. 为了减少振动噪音，除在机房机座下设弹性垫层外，还应在机房下部设置隔音层
D. 机房的面积要大于井道的面积

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