风湿性关节炎与急性痛风性关节炎的区别是()
A.类风湿因子阳性
B.应用秋水仙碱疗效显著
C.发生在青少年
D.关节疼痛为游走性
E.应用水杨酸制剂疗效显著
参考答案:C, D, E
_____ many times, John still couldn't work out the problem. [ ]
A. Trying
B. Tried
C. To try
D. Having tried
自信训练有哪些终极目标