Either you or Tom _____ going to Beijing tomorrow. [ ]
A. are
B. is
C. was
D. were
答案:B
酸泵抑制剂()
A.丙谷胺
B.前列腺素E2的衍生物
C.奥美拉唑(omeprazole)
D.派吡氮平
E.多潘立酮
某显色剂In在pH=3~6时呈黄色,pH=6~12时呈橙色,pH>12时呈红色,该显色剂与金属离子的配合物MIn也呈红色,显色反应的反应条件为______。
A.中性 B.弱酸性 C.弱碱性 D.强碱性