在50mL0.1mo1·L-1HAc中加入50mL0.1mo1·L-1NaAc,溶液pH变为()。
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You work as the enterprise exchange administrator at Xxx .Xxx is using Microsoft Exchange Server 2003 as their messaging solution.You have added a new server to the network and deployed Exchange Server 2010 on it with the default settings.What command must be used to change the default e-mail address policy?()
A. You must use the setup /NewProvisionedServer.
B. You must use the lpsetupui.exe.
C. You must use the Set-EmailAddressPolicy cmdlet.
D. You must use the Setup.com /AnswerFile:Exchange-All.xml.
制冷系统充入高压气体检漏时,严禁充氧气、氢气及()气体。
为编制结算文件需要用到的资料可能包括招标文件、投标文件、工程承发包合同、图纸及图纸会审记录、变更通知单、签证、施工组织设计、进度计划、施工记录、定额、费用调整文件、竣工图、工程验收证书等。
A. 正确
B. 错误
以下是样本统计量的有()。
A. 样本平均数
B. 样本比例
C. 样本标准差
D. 样本方差