域网由()统一管理,提供文件、打印、通信及数据库等服务功能。
A、网络体系结构
B、网卡和网线
C、服务器
D、网络操作系统
参考答案:D
Now many parents send their children to foreign countries, _______ they want them to get a better
education. [ ]
A. until
B. though
C. because
新生儿颅脑超声最常用探测声窗是(). ①前囟 ②后囟 ③乳突囟 ④蝶囟
A.①②
B.①③
C.③④
D.以上各项均是