如何识别一个文件的类型？什么叫文件关联？文件关联的作用是什么？
You are creating an application that provides information about the local computer.The application contains a form that lists each logical drive along with the drive properties，such as type，volume label，and capacity.You need to write a procedure that retrieves properties of each logical drive on the local computer. What should you do？（） ["Retrieve an instance of the FileSystemInfo class.","Retrieve an instance of the DriveInfo class.","Retrieve the drive capacity by using the DriveInfo.TotalSize property.","Determine if the drive is available by using the FileSystemInfo.Attributes property.","Retrieve the drive names of all logical drives on a computer by using the DriveInfo.GetDrives method.","Retrieve the drive capacity by using the FileSystemInfo.Attributes property."]
涉案物品价格鉴证工作的主管部门是（）。 ["各级人民法院","各级人民检察院","各级公安机关","各级政府价格主管部门"]
You perform a security audit of a server named CRM1. You want to build a list of all DNS requests that are initiated by the server.You install the Microsoft Network Monitor 3.0 application on CRM1. You capture all local traffic on CRM1 for 24 hours. You save the capture file as data.cap. You find that the size of the file is more than 1 GB. You need to create a file named DNSdata.cap from the existing capture file that contains only DNS-related data. What should you do？（） ["Apply the display filter !DNS and save the displayed frames as a DNSdata.cap file.","Apply the capture filter DNS and save the displayed frames as a DNSdata.cap file.","Add a new alias named DNS to the aliases table and save the file as DNSdata.cap.","Run the nmcap.exe \/inputcapture data.cap \/capture DNS \/file DNSdata.cap command."]
简述石英脉型黑钨矿床的成因
水轮机汽蚀浸蚀的特征是什么？
