问题
选择题
—Where is my ______?
—It's in the drawer. [ ]
A. bookcase
B. book
C. desk
D. dresser
答案
答案:B
—Where is my ______?
—It's in the drawer. [ ]
A. bookcase
B. book
C. desk
D. dresser
答案:B
将甲和乙两种气体以任意比例混合通入到过量的丙溶液中,都能产生沉淀的组合是( )
序号 | 甲 | 乙 | 丙 |
① | CO2 | SO2 | 石灰水 |
② | HCl | CO2 | 石灰水 |
③ | CO2 | SO2 | Ba(NO3)2 |
④ | NO2 | SO2 | BaCl2 |
⑤ | CO2 | NH3 | CaCl2 |
A.②③④
B.②③④⑤
C.①③④
D.①②③④