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【单选题】
二氧化铅-重量法原理:空气中的SO2、硫酸蒸汽、H2S等与采样管上的二氧化铅反应生成硫酸铅,用碳酸钠溶液处理,是硫酸铅转化为碳酸铅,释放出硫酸根离子,再加入(),生成BaSO4沉淀,用重量法测定,其结果以每日在100cm2二氧化铅面积上所含SO3的mg数表示。A.
AgCl溶液
B.
AgNO3
C.
BaCl2溶液
D.
Pb(NO3)2
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反馈参考答案：
举一反三
【单选题】The youth continued to gawk at that pretty girl and did not answer.
A.
stare stupidly
B.
stare intently
C.
grin innocently
D.
smile broadly
【单选题】Strange how the habits of his youth clung to him still! (Para. 1)
A.
It was strange that he still wanted to keep the habits of his early days.
B.
It was strange how up to that moment he had continued doing things the way he had always done them from boyhood.
C.
The habits of his early days are so strange that he still wanted to keep them.
【简答题】如果m和n是互质数,那么它们的最大公因数是( ),最小公倍数是( )
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