采煤工作面初次放顶人员要注意什么？
一战后的“凡尔赛――华盛顿”体系被称作“上一轮争夺的结束，下一轮争夺的开始”。下列表述中不能反映这一结论的一项是（）。 ["美日争夺亚太地区的矛盾","英法争夺欧洲霸权的矛盾","英美争夺海上霸权的矛盾","美苏争夺世界霸权的矛盾"]
You have a main office and five branch offices. The offices connect to each other by using a WAN link. An Active Directory site exists for each office. Each site has a separate IP site link to all other sites. The main office site is configured as a hub site. You have an Exchange Server 2010 organization. You discover that messages sent between offices are not routed through the Hub Transport servers in themain office. You need to ensure that all messages sent between offices are routed through the Hub Transport serversn the main office. What should you do？（） ["Change all IP site links to SMTP site links.","Modify the Exchange-specific cost for each site link.","From the Hub Transport servers in each site，create a journal rule.","From the Hub Transport servers in each site，create a transport rule."]
安全生产标准化评审分为（）级。 ["一","二","三"]
6KV母线电源联络开关装有哪些保护？
系统安全评价的意义是什么？
