系统性红斑狼疮与类风湿关节炎的鉴别（）
A.关节肿胀
B.类风湿因子阳性
C.抗核抗体阳性
D.狼疮细胞阳性
E.X线检查示骨质破坏
参考答案：E
The World Wide Web is the（）to allow users to browse from one（）to another and to inspect the information available without using complicated commands and protocols.
A.information system
B.Internet site
C.net system
D.Internet
