土壤胶体有两种不同的状态
参考答案:溶胶和凝胶。
The kids seated themselves ______ to the teacher and listened _______ with great interest. [ ]
A. closely; close
B. close; closely
C. closely; closely
D. close; close
怀疑半月板损伤时最精确、理想的辅助检查方法是()。
A.X线检查
B.关节造影术
C.CT检查
D.B型超声检查
E.关节镜检查