从下列实验事实所引出的相应结论正确的是[ ]
实验事实 结论
A．其它条件相同，Na2S2O3溶液浓度越大， 当其它条件不变时，增大反应物浓度化学反应速率加快
析出硫沉淀所需时间越短
B．在化学反应前后，催化剂的质量和化学 催化剂一定不参与化学反应
性质都没有发生改变
C． 在常温下N2很难与金属化合 氮元素的非金属性很弱
D． NaOH晶体不能导电 NaOH是非电解质
答案：A
| 在B栏中找出与A栏问题相对应的答语，将序号填在括号里。 |
| A ( ) 1. What's the dog doing? ( ) 2. What are they doing? ( ) 3. Can geese swim? ( ) 4. Can I speak to your mom? ( ) 5. What is your mother doing? ( ) 6. Is your father reading a newspaper? | B A. Yes, they can. B. It's swinging. C. They are dancing. D. She is washing the clothes. E. Sure. F. Yes, he is. |