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[问题4] 在图2-18中，若只要删除地址为10.5.1.1的ARP记录，可以采用的命令如下。 C:\＞arp (11) (12)
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The world’s population continues to grow. There now are about 4 billion of us on the earth. That could reach 6 billion by the end of the century and 11 billion in another 75 years. Experts long have been concerned about such growth. Where will we find the food, water, jobs, houses, schools and health care for all these people A major new study shows that the situation may be changing. A large and rapid drop in the world’s birth rate has taken place during the past 10 years. Families generally are smaller now than they were a few years ago. It is happening in both developing and industrial nations. Researchers said they found a number of reasons for this. More men and women are waiting longer to get married and are using birth control devices and methods to prevent or delay pregnancy. More women are going to school or working at jobs away from their homes instead of having children. And more governments, especially in developing nations, now support family planning programs to reduce population growth. China is one of the nations that has made great progress in reducing its population growth. China has already cut its rate of population growth by about one half since 1970. China now urges each family to have no more than one child. And it hopes to reach zero population growth, the number of births equaling the number of deaths, by the year 2000. Several nations in Europe already have fewer births than deaths. Experts said that these nations could face a serious shortage of workers in the future. And the persons who are working could face much higher taxes to help support the growing number of retired people. "Family planning programs" means ______.
依药品的品种、规格、适应证、剂量及给药途径不同，我国对药品实行 ( )
______是指我国与其他国家、地区进行商品和服务交换，包括出口和进口两个方面。
阅读以下技术说明，根据要求回答问题1～5。 [说明] 某公司内部网络通过一台24端口的交换机连接19台PC和两台服务器，使用一台硬件防火墙连接Internet，其网络拓扑结构如图2-21所示。公司内部使用的IP地址块为10.5.1.0/24。 在PC1的DOS命令窗口中，运行某条Windows命令后系统的返回信息如图2-22所示。 使用Sniffer抓包工具在PC1中捕获的、由PC1以太网接口发出的某数据包的部分信息如图2-23所示。 [问题1] 在图2-22所示的DOS命令窗口中，所运行的Windows命令是 (1) 。地址224.0.0.0是一个 (2) 。
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