我们对PSH模型中的外部世界层的理解,通常比较无知,会存在诸多错误。()
参考答案:对
If you often feel tired and can't focus your attention, that is________you have to stop working too
hard and to have a rest.[ ]
A. why
B. whether
C. when
D. what
类风湿关节炎的关节症状是()
A.对称性关节炎
B.侵犯小关节
C.关节附近的肌肉萎缩
D.出现晨僵
E.以上都是