PPP项目采用（）方式开展采购的，按照政府采购法律法规及有关规定执行。 ["A.公开招标 ","B.邀请招标 ","C.竞争性谈判 ","D.单一来源采购"]
Which three statements are true about EIGRP route summarization?（） ["When manual summarization is configured, the router immediately creates a route that points to null0 interface","Manual route summarization is configured in router configuration mode when the router is configured for EIGRP routing","Manual route summarization is configured on the interface","The ip summary - address eigrp command generates a default route with an administrative distance of 5","When manual summarization is configured, the summary route will use the metric of the largest specific metric of the summary routes","The ip summary - address eigrp command generates a default route with an administrative distance of 90"]
由于男女都有X染色体，故不能通过检测X染色体来确定性别。
生境恢复包括（）、（）、（）、（）等。
You are employed as the exchange administrator at Company.com.the Company.com network contains an exchange 2010 organization that contains a single mailbox server named -ex01.Company.com has its headquarters in stockholm where you are located.-ex01 in turn contains two mailbox databases named kingdatabase1 and kingdatabase2.you receive an instruction from the cio to restore a backup of kingdatabase1.to ensure productivity you need to make sure that all examways users can connect to the mailboxes on kingdatabase1 whilst you doing the restore. What should you do？（） ["Your first step should be to create a Client Access server array.","Your first step should be to create a database availability group （DAG）.","Your first step should be to create a recovery storage group.","Your first step should be to create a Recovery Mailbox database."]
某机电安装公司承担北方某城市小区供热管网工程施工，开工前，项目经理进行了全面的质量策划，并指令专业工程师编制质量控制程序。工程按期完工，由于建设单位配套设施尚不具备条件，虽已到供暖期，没能进行试运。由于寒潮突然袭击，使当地气温骤降，随后检查发现一台主要设备和部分阀门冻裂，查找原因是因为施工单位水压试验后，残水没有排净造成的。施工单位按质量事故处理程序对事故进行了处理，并按以下六方面编写提交了事故处理报告：
（1）事故调查的原始资料、测试数据；
（2）事故原因分析、论证；
（3）事故处理依据；
（4）事故处理方案、方法及技术措施；
（5）检查复验记录；
（6）事故处理结论。主要设备和部分阀门冻裂是由于环境温度造成的，从质量预控角度分析，影响工程项目施工的环境因素包括哪几方面？本案例质量事故是什么因素造成的？
