问题
选择题
—How do you do? — [ ]
A. How did you do?
B. Thank you.
C. How do you do?
答案
答案:C
—How do you do? — [ ]
A. How did you do?
B. Thank you.
C. How do you do?
答案:C
将与“实验操作”相对应的“实验现象”的字母代号填入“答案”栏中。
实验操作 | 答案 | 实验现象 |
(1)将浓硫酸滴在小木条上 | A.产生白烟 | |
(2)将分别蘸有浓氨水和浓盐酸的玻璃棒靠近 | B.产生蓝色物质 | |
(3)在盛有KI淀粉溶液的试管中滴加氯水 | C.溶液呈红色 | |
(4)在盛有FeC13溶液的试管中滴入2滴KSCN溶液 | D.变黑色 |