问题
选择题
The ability ________ an idea is as important as the idea itself.[ ]
A. expressing
B
. expressed
C. to express
D. to be expressed
答案
答案：C
搜题请搜索小程序“爱下问搜题”
The ability ________ an idea is as important as the idea itself.[ ]
A. expressing
B. expressed
C. to express
D. to be expressed
答案：C
向烧杯中逐滴加入x溶液至过量，反应过程中生成沉淀或气体的质量与加入x溶液的质量关系能用下图所示的曲线表示的是
| 序号 | 烧杯中的物质 | x溶液 |
| ① | 铜锌合金 | 稀HCl |
| ② | 盐酸与稀硫酸 | Na2CO3溶液 |
| ③ | 生锈的铁钉 | 稀HCl |
| ④ | H2SO4和CuSO4溶液 | NaOH溶液 |
