Internet上的服务都是基于一种协议,WWW服务是基于______协议。
A.SMTP
B.TELNET
C.HTTP
D.FTP
参考答案:C
Lucy has ________ all of the goals she set for herself in high school and is ready for new challenges
at university.[ ]
A.acquired
B.finished
C.concluded
D.achieved
窝沟封闭中乳牙的酸蚀时间为()
A.20s
B.40s
C.10s
D.60s
E.2min