根据《最低生活保障审核审批办法（试行）》，对申请最低生活保障家庭经济状况调查结果的客观性、真实性进行民主评议时，村（居）民代表人数不得少于参加评议总人数的（）。 ["三分之一","二分之一","三分之二","四分之三"]
从咽漱液中分离流感病毒常接种于（） ["Hela细胞","豚鼠","鸡胚和狗肾传代细胞","鸡胚和Hela细胞"]
脚、矿石码头堆场机械的堆料能力应与什么相匹配？（） ["码头装船能力","装车能力","卸车能力","卸船、卸车能力"]
在制定调查研究计划的过程中，最为核心的环节是（）。 ["编写调查研究纲要","明确调查研究目的","制定调查研究计划","调查研究前期准备"]
Refer to the exhibit. Which two statements are correct regarding the creation of a multicas tdistribution tree？ （） [" Each router determines where to send the JOIN request."," The tree will be built based on the IP address of the E2 interface on router E"," The best path to the source will be discovered in the unicast routing table on router B"," The best path to the source will be discovered in the unicast routing table on router C"," The best path to the source will be discovered in the unicast routing table on router E"]
依照河南省邮政条例的规定，用户在什么情况下可以依法拒绝签收快件？
