土壤酸胶体
参考答案：
胶粒表面带负电荷，吸附的交换性离子是氢离子和其他阳离子的土壤胶体。土壤酸胶体以腐殖酸胶体和氧化硅胶体为主。
Mr. Li Kunming. He the city three times. This time he Kunming for three days.
A. has been to ,have gone to ,have been in
B. has gone to ,has been to , has been in
C. have been in, has been to ,have gone to
D have gone to, have been in , has been to
吡格列酮
A．磺酰脲类B．双胍类C．α-葡萄糖苷酶抑制剂类D．噻唑烷二酮类E．胰岛素衍生物类
