影响知识保持的因素有哪些？
三相三线有功电能表，感性负载电压互感器A相熔丝断有功电量（）。 ["少计二分之一","少计超过二分之一","少计小于二分之一","不确定"]
You are the administrator of an Active Directory domain. The network contains a Windows Server 2003 domain controller named Server1Users report that they experience intermittent delays when they log on to Server1. Administrators report that replication attempts between Server1 and other domain controllers are occasionally delayed.You need to verify the cause of the intermittent connection delays to Server1. You also need to find out whether the problem is related to a hardware deficiency on Server1. You need to track these delays over a period of one day. What should you do first？（） ["Run the netdiag \/verbose command to perform a network diagnostic test on Server1.","Run the replmon command to view the Active Directory replication status on Server1.","Use Network Monitor to view the network traffic packet contents between Server1 and all other computers.","Create a System Monitor counter to track the queue lengths on the network adapter on Server1."]
某城市环路立交桥工程长1.5km，其中跨越主干道路部分采用现浇预应力砼箱梁结构，跨径47.6m，鉴于在城市主干道上施工，承建该工程的施工项目部为此制订了专项施工方案，拟采取以下措施：1）占用一条慢行车道，选择在夜间时段，自行封路后进行箱梁支架作业。2）在实施遇到下列一些情况：①施工单位根据预制梁的尺寸、数量、工期确定预制台座的数量、尺寸、对张拉机具作了校验，并对预应力的张拉、灌浆等施工工艺进行了控制。②跨越既有道路部分为现浇梁施工，采用支撑间距较大的门洞支架，为此编制了专项施工方案，并对支架强度作了验算。关于支架还应补充哪些方面的验算？
试述如何防止再热裂纹。
商鞅变法
