局域网使用Ping命令时超时的原因？
参考答案：
【故障现象】电脑通过集线器与其他设备相连并在同一网段上，但是使用Ping命令时显示“Requsttimedout”。【故障处理】这种现象既可能是硬件故障，也可能是设置故障。首先检查集线器的显示灯、电源、连线是否正常，再检查集线器是否和其他集线器级联或堆叠，最后用替换法检查是否交换机本身有损坏。
阅读下面短文，根据短文内容完成表格中所缺信息，每空一词。（共10小题，每小题1分，计10分） March 25 is the 17th National Day of Education on the Safety of Elementary and Middle School Students. The theme of the day this year is to give students more knowledge about how to keep safe. How can you keep yourselves safe? Here are some suggestions. When there is a fire: Shout out “Fire”! Call 119! Try to find a safe exit and get away quickly. Don’t use a lift. Use a piece of cloth to cover your mouth and nose. When there is an earthquake at school: Stay calm. Follow the teachers’ instructions. Quickly move under the desk. Don’t jump out of windows or run out. When you are on the street: Wait for the green traffic light. Look left and right before crossing the street. Don’t run across the street. When you are eating: Wash fruits and vegetables carefully before eating them. Check the expiration dates(保质期) of the food. Don’t eat the food if it looks or smells bad. When you are at school: Take care not to fall down or hurt yourself. Don’t run, jump or push while going upstairs or downstairs. Take care of yourself all the time.
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