在滚珠丝杠螺母间隙的调整结构中，齿差式调隙机构的精度较高，但结构复杂，制作成本高。
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以电解法生产的氢气氧气充装站，必须在氧气管道上设置分析氧中（）含量的自动分析仪器。
You need to design an administrative model that meets all business and technical requirements. What should you do？（）
A. Place the mailboxes for each region on a separate server. Create an administrative group for each region. Assign each regional technician Exchange Full Administrator permission over that region’s administrative groups. Assign the main office IT staff Exchange Full Administrator permission over each administrative group.
B. Place the mailboxes for each region on a separate server. Create an administrative group for each region. Assign each regional technician Exchange Full Administrator permission over all administrative groups. Assign the main office IT staff Exchange Full Administrator permission over each administrative group
C. Place the mailboxes from multiple regions on each server. Create an administrative group for each server. Assign each regional technician Exchange Full Administrator permission over the administrative groups that contain servers that hold mailboxes for that region. Assign the main office IT staff Exchange Full Administrator permission over each administrative group
D. Place the mailboxes from multiple regions on each server. Create a single administrative group for all servers. Assign each regional technician and the main office IT Staff Exchange Full Administrator permission over the administrative grou
鸡蛋在孵化期中胚胎发育的外部特征变化可分为四个阶段，分别是（）、（）、（）、（）。
国际劳工组织是联合国机构中负责社会和劳工事务的一个专门机构。它成立于哪一年？
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