脱碳系统的作用是什么?
参考答案:
(1)脱除低变出口气中的CO2,制得CO2<800PPm的合格工艺气。
(2)制得纯度>99%的合格CO2气体做为生产尿素的原料。
能用勒夏特列原理解释的是 [ ]
A.红棕色的NO2,加压后颜色先变深后变浅
B.工业上合成NH3反应使用催化剂
C.实验室可以采用排饱和食盐水收集Cl2
D.由H2、I2(g)、HI(g)气体组成的平衡体系加压后颜色变深
根据句意或首字母填写,每空一词。
1. You'd better _______a taxi to go there. It's a long way.
2. He _______to school every day because his house is near our school.
3. I always ride my bike to the s_______station
4. Her mother is ill. She has to b_______ her little sister.
5. There are sixty m_______in an hour.
6. Do you walk to school or go _______ bus?
7. —What's your f_______ month of a year?
—It's May.
8. —What time do you go to school?
—At 7 o'_______ .