第一代计算机
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"]
What is the difference between the IPv6 addresses ：：/0 and ：：/128？（） ["：：\/0 is the unspecified address， and ：：\/128 is the multicast address","：：\/0 is the unicast address， and ：：\/128 is the anycast address","：：\/0 is the unicast address， and ：：\/128 is the multicast address","：：\/0 is the anycast address， and ：：\/128 is the multicast address","：：\/0 is the default route， and ：：\/128 is the unspecified address","：：\/0 is the anycast address， and ：：\/128 is the default addre"]
耐张线夹、拉线线夹应采用（）并经一试验合格，方可使用。 ["A.可锻造件 ","B.不锈钢件 ","C.铸铁件 ","D.高碳钢件"]
土壤的本质属性是什么？在农作实践上中国土壤有哪些主要类型？
