已知光栅单色器的倒线色散率为2nm/mm，欲测Co240.73nm的吸收值，为防止Co240.63nm干扰，应选择狭缝宽度为多少？
参考答案：
根据括号内所给词的适当形式填空
1. It is very (importance) for us to work hard for a better life.
2. We have a (please) journey during the l0-day holiday.
3. The villagers got good (medicine) care in the countryside.
4. Now I can go to work instead of (go) by car.
5. Jack is very happy, because he got an "A" in the (finally) exam.
（）的作用是收集、输送旱流污水。
A.清水泵站
B.污水泵站
C.循环水泵站
D.混合泵站
