问题
选择题
The computer centre, _______ last year, is very popular among the students in this school. [ ]
A. open
B. opening
C. having
D. opened
答案
答案：D
搜题请搜索小程序“爱下问搜题”
The computer centre, _______ last year, is very popular among the students in this school. [ ]
A. open
B. opening
C. having
D. opened
答案：D
如图所示，在干燥的圆底烧瓶中充满某气体a，胶头滴管中吸有少量液体b，当把溶液b挤进烧瓶后，打开止水夹不能形成“喷泉”的组合是（ ）
| 干燥气体a | 液体b | |
| A | NH3 | 水 |
| B | HCl | 水 |
| C | CO2 | NaOH溶液 |
| D | Cl2 | 饱和食盐水 |
A．A
B．B
C．C
D．D
