题目内容
It's a good habit to wash your hands ________ you have meals．
查看答案
搜索结果不匹配？点我反馈
更多问题
下列软件中，属于操作系统的软件是（ ）
1. Agriculture occupies an important place in the _________ economy.2. Olympics is the biggest sports _______ in the world.3.I was sad because I felt that the splendid years of my ________ childhood had come to an end.4.The conference might reconvene (重新召开)after its opening ________ .5.The government has promised a/an _______￡1 billion for health care.
假设一个主机的IP地址为192.168.5.121，而子网掩码为255.255.255.248，那么该IP地址的网络号为多少？主机号为多少？
一个公司有10个部门，要求给每个部门划分不同的网段，但是都在192.168.1.0这个大网内，并且每个部门要容纳20台计算机。请为这个公司选择子网掩码。
微信支付 
支付宝支付