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【简答题】
根据短文内容及首字母提示,填写所缺单词。(每空l分,计l0分,每空一词) Do you want to be the best student in your class? Be the envy of all of your friends in school and be the p 小题1: of your teachers and parents ! First, a best student must study hard. This is the primary task of a student. Remember, if you don’t do anything, you will be nothing. Ask questions in class if you do not understand something. In addition, try to enjoy all the s 小题2: you learn at school and work hard on them. It seems that hard-working students can have success more e 小题3: . Second, good study habits are very useful. For example, when you prepare for a test, make s 小题4:that you have all of the proper materials including books, pencils, paper, calculators, etc. Underline the words that you do not understand. And try marking some of the themes mentioned in the book. Then, come up w 小题5: study questions and try to answer them. You’d better stop to take a r 小题6: every hour to refresh your memory. Don’t forget to try asking your parents for h 小题7:_. They have personal learning experiences and can help you with your studies in many ways. Usually, the students who ask their parents for help can do b 小题8: in class than those don’t. Lastly, remember to never give up. You are already on your way in becoming the best student! The t_ _ 小题9: _ ___ is that it doesn’t matter to fail if you pick yourself up and try even harder. A 小题10: a lot of the famous people were all once failures, they never lost heart and managed to climb to the top and succeed.
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【单选题】氟离子选择电极法测定大气固定污染源中氟化物含量时,使用的总离子强度调节缓冲液配制时,应调节pH为 左右。( )
A.
5 .2
B.
5 .5
C.
5 .8
D.
7 .5
【单选题】氟离子选择电极法测定大气固定污染源中氟化物含量时,所采集的样品在常温下可保存()
A.
一周
B.
一天
C.
一个月
【判断题】氟离子选择电极法测定大气固定污染源中的氟化物,样品的采集所使用的采样管与吸收瓶之间的连接管,采用聚四氟乙烯管或聚乙烯塑料管,并要求尽可能短。
A.
正确
B.
错误
【单选题】氟离子选择电极法测定大气固定污染源中氟化物含量时,测定样品与绘制标准曲线时的温度之差不应超过±()℃。
A.
2
B.
3
C.
4
【简答题】离子选择电极法测定大气固定污染源中的氟化物,污染源中只存在气态氟时,可采用()方法,在采样管出口串联两个装有50m1吸收液的多孔玻璃吸收瓶,以()L/mln的流速采集5~20min。
【单选题】HIV对下列理化因子不敏感的是
A.
56℃加热30分钟
B.
75%酒精
C.
0.2%次氯酸钠
D.
2%煤酚皂
E.
紫外线和γ射线
【判断题】先天之本为脾,后天之本为肾。 ( )
A.
正确
B.
错误
【单选题】氟离子选择电极法测定大气固定污染源中氟化物含量时,采样结束后将吸收瓶中的样品全部转移到(),并按要求洗涤、编号和记录。
A.
棕色玻璃瓶
B.
聚乙烯瓶
C.
玻璃瓶
【单选题】氟离子选择电极法测定大气固定污染源中氟化物含量时,使用的总离子强度调节缓冲液配制时,应调节pH为()左右。
A.
5.2
B.
5.5
C.
5.8
【简答题】离子选择电极法测定大气固定污染源中氟化物时,污染源中尘氟和气态氟共存时,采用烟尘采样方法进行(),在采样管的出口串联三个装有75m1吸收液的()吸收瓶,分别捕集尘氟和气态氟。
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