问题
选择题
They all wanted to be teachers at that time, but _____ are teachers now. [ ]
A. none
B. none of them
C. no one
D. both
答案
答案：B
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They all wanted to be teachers at that time, but _____ are teachers now. [ ]
A. none
B. none of them
C. no one
D. both
答案：B
已知200 ℃，反应2NO(g)＋2CO(g)
2CO2(g)＋N2(g)的平衡常数K＝10，则下列情况达到平衡状态的是( )
| c(NO) | c(CO) | c(CO2) | c(N2) | |
| A | 1 | 1 | 0.1 | 0.1 |
| B | 0.1 | 0.1 | 0.1 | 0.1 |
| C | 0.2 | 0.1 | 0.2 | 1 |
| D | 0.3 | 0.2 | 0.2 | 0.3 |