问题
选择题
| We were disappointed ____ that the match had been cancelled. |
| A. to tell B. to have told C. to be told D. telling |
答案
答案：C
搜题请搜索小程序“爱下问搜题”
| We were disappointed ____ that the match had been cancelled. |
| A. to tell B. to have told C. to be told D. telling |
答案：C
将16g硫在给定质量氧气中燃烧，有如下数据：观察、分析表中数据，下列说法不正确的是（ ）
| 组别 | 1 | 2 | 3 | 4 | 5 |
| 给定O2的质量/g | 10 | 16 | 20 | 24 | 32 |
| 生成SO2的质量/g | 20 | 32 | 32 | 40 | 32 |
A．第3组数据符合质量守恒定律
B．第4组数据符合质量守恒定律
C．反应时硫跟氧气的质量比为1：1
D．生成物中两种元素质量比为1：1