题目内容

除去空分液氮带来的冷量，液氮洗单元的冷量主要来自于（）。

A. 膨胀机等熵膨胀制冷
B. 配氮扩散制冷
C. 液氨蒸发制冷
D. 工艺原料气

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更多问题

You are a systems administrator who is attempting to troubleshoot a problem with accessing a Web site ona computer running Windows Server 2008. In the past， users have been able to access the Web site byusing http：//hr.contoso.com. However， when they attempt to access the site now， they receive the errormessage "Internet Explorer Cannot Display The Web page." Which of the following steps should you taketo resolve the error？（）

A. Using Server Manager， add the HTTP Errors server role.
B. Using Server Manager， verify that the World Wide Web Publishing Service has been started.
C. Verify the configuration of the usersWeb browsers.
D. Using Server Manager， add the HTTP Logging server role.

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