当信号开放后，列车进入信号机内方第一区段，DGJ落下后QJJ和GJJ（）。
A. QJJ逐个落下和GJJ落下
B. QJJ全部落下和GJJ落下
C. QJJ落下和GJJ最后落下
D. QJJ和GJJ同时落下
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在火灾现场尚未停电时，应设法先切断电源，切断电源时应注意什么？
在ERP预算管理系统中，下列哪种类型成本中心一定可以更改子范围（）
A. 已启用成本中心
B. 新增成本中心
C. 一级成本中心
D. 允许预算的成本中心
促进（）同步发展，建设社会主义新农村，走中国特色新型工业化道路，建设创新型国家和世界科技强国。
You work as a network Exchange administrator at Company.com.The Company.com network currently consists of a single Active Directory forest containing a single domain named Company.com.The Company.com organization makes use of Microsoft Exchange Server 2010 as their messaging solution.you are responsible for managing two edge transport servers named -ex05 and -ex06.to ensure productivity within the organization you receive an instruction to make sure that e-mail messages sent from the internet is sent to -ex06 in the event of -ex05 failing. What should you do？（）
A. This can be accomplished by creating two MX records.Then the mx record for -ex05 should be assigned a priority of 20.Thereafter the mx record for -ex06 should be assigned a priority of 10.
B. This can be accomplished by creating two SRV records.Then the srv record for -ex05 should be assigned a priority of 20.Thereafter the srv record for -ex06 should be assigned a priority of 10.
C. This can be accomplished by creating two MX records.Then the mx record for -ex05 should be assigned a priority of 10.Thereafter the mx record for -ex06 should be assigned a priority of 20.
D. This can be accomplished by creating two SRV records.Then the srv record for -ex05 should be assigned a priority of 10.Thereafter the srv record for -ex06 should be assigned a priority of 20.
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