简述先河XHN2000BN02分析仪的工作原理。
参考答案：
分析仪是利用03和NO的气相反应所发出的光强大小，来测量大气中NO的浓度，称化学发光法。第一循环直接将样气送入反应室测出样气中的‘NO浓度。第二循环先通过钼转化器将样气中的N02转化为NOj然后利用化学发光法测定出气体中NOx（NO+N02）的浓度，再用NO工的浓度减去最初NO的浓度即得到N02的浓度。
请先阅读下面短文，掌握其大意，然后从方框中所给的词中选出最恰当的10个，用其适当形式填空，并将答案填写到答题卷的相应位置。每个词限用一次。
 There are lots of jobs which we can do. Some are just ordinary (普通的) jobs and 56 are careers (职业), but each person likes something 57 .  My favorite job is that of a (n) 58 . You can make beautiful thing and you don't have to 59 to get to work. Also, you don't have to do what other people tell you. You can 60 what you are going to paint and then you just do it. The only 61 thing is that artists don't make very much money. The worst job I can think of is a pilot's. You have to work for long hours and it's 62 tiring and boring. If you make a serious mistake, 63 will go wrong. It's too dangerous. The only good thing is that pilots are paid a lot of money, 64 money isn't the most important thing about a job. In a word, 65 job has both good and bad things about it, but I think that artists have got the best jobs. |