用EDTA直接滴定有色金属离子,终点所呈现的颜色是指示剂一金属离子络合物的颜色。
参考答案:错
Hainan is a good place ________ in winter. We all want ________ there. [ ]
A. living; living
B. to live; to live
C. living; to live
D. to live; living
怎样清除建筑物表层损坏混凝土?