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25 °C时,0.05mol/l Ba(OH) 2 溶液中氢离子浓度? 2.已知25 °C 时,0.1mol/l HAc 解离度为1.32%,求氢氧根浓度? 3.某温度下,纯水中氢离子浓度约为 1x10 -6 mol/l,则氢氧根浓度为? 4.已知 25 °C某溶液的氢氧根浓度为 1x10 -3 mol/l,计算该溶液的氢离子浓度? 5. 已知 25 °C时,0.1mol/l HCN 解离度为0.01%,求由水电离的氢离子浓度?
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【简答题】请听下面一段材料，回答第1-4题。 1. What has the woman been doing all afternoon? A. Looking at the apartment ads. B. Reading some really interesting news. C. writing some house sales ads. 2. What does the man think ...
【单选题】搜索含有 data bank 的PDF文件,正确的检索式为( )。
A.
data and bank and pdf
B.
data+bank+pdf
C.
data+bank+file:pdf
D.
"data bank" filetype:pdf
【简答题】英译汉: Attached are details of the shipments to be insured under our usual conditions. The goods leave here per S.S. Twilight for Liverpool on July 1.
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Yes, I am a country fan
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Yes, I am a pop fan
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【单选题】搜索含有“data bank”的PDF文件,正确的检索式为:
A.
data+bank+pdf
B.
data+bank+file:pdf
C.
data and bank and pdf
D.
data bank filetype:pdf
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