问题
选择题
The news finally came, which________them all.[ ]
A. disappoints
B. disappointing
C. disappointed
D. disappoint
答案
答案:C
The news finally came, which________them all.[ ]
A. disappoints
B. disappointing
C. disappointed
D. disappoint
答案:C
下表中,对第Ⅰ、Ⅱ栏判断都正确的是
第Ⅰ栏 | 第Ⅱ栏 | 判断 | |
A. | 铁与稀硫酸反应可生成氢气 | 铁丝在氧气中点燃生成Fe3O4 | Ⅰ对;Ⅱ对 |
B. | Na2CO3溶液中,c(Na+)=2c(CO32-) | 21H原子的中子数和质子数相等 | Ⅰ对;Ⅱ错 |
C. | Na2O2与H2O反应的化学方程式为 Na2O2+H2O=2NaOH+O2↑ | 常温下可用铝罐贮存浓硝酸 | Ⅰ对;Ⅱ对 |
D. | 用AgNO3溶液和稀硝酸可区分Na2CO3、NaBr溶液 | 25℃时,改变醋酸溶液的浓度,醋酸的电离平衡常数也改变 | Ⅰ对;Ⅱ对 |
A.A
B.B
C.C
D.D