在装配图中，剖面厚度在（）以下的图形允许以涂黑来代替剖面符号。 ["2mm","3mm","4mm","5mm"]
The Cisco SA 500 Series Security Appliances are built specifically for businesses with less than 100 employees. What are three important benefits of this device？ （） [" site-to-site VPN for remote offices"," business-grade firewall"," Cisco IOS software-based"," email security"," XML support"," premium support via SMARTnet"]
根据《高新技术企业认定管理办法》的规定，高新技术企业认定必须满足最近三个会计年度研究开发费用总额占销售收入总额一定比例的要求，下列针对具体要求表述错误的是（）。 ["最近一年销售收入小于5000万元的企业，研究开发费用总额占销售收入总额的比例不低于5%","最近一年销售收入在5000万元至20000万元的企业，研究开发费用总额占销售收入总额比例不低于4%","最近一年销售收入在20000万元以上的企业，研究开发费用总额占销售收入总额比例不低于3%","企业在中国境内发生的研究开发费用总额占全部研究开发费用总额的比例不低于60%""]
After you install a new update， an application on the computer fails to run. You need to remove the update. What should you do？（） ["Use the Software Explorer window.","Use the Add or Remove Programs window.","Restore hidden updates.","Use the Installed updates list on the Windows Update window."]
在进行工频交流耐压试验时，试验的容抗与试验变压器的漏抗是串联的，当回路的自振频率与电源的基波或高次谐波频率相同而产生（）时，在试品上就会产生比电源电压高得多的（）。
驱动机由哪些部件组成？
