可能的诊断是
A.左膝关节结核性滑膜炎B.左膝关节风湿性关节炎C.左膝关节色素沉着绒毛结节性滑膜炎D.左膝关节滑膜瘤E.左膝关节类风湿性滑膜炎
参考答案:A
当前人民币汇率制度的特点是( )。
A.汇率的形成以外汇市场供求为基础
B.多元汇率
C.单一汇率
D.浮动汇率
E.有管理的汇率
— We did not see him at the lecture yesterday.
— You _______ him, since I went to an international conference with him.
A.mustn’t have seen
B.can’t have seen
C.couldn’t see
D.needn’t have seen