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【单选题】
Gentlemen: Thank you for your letter of March 12, (144) you expressed your willingness to open an account with us. From your letter we are glad to learn that you are particularly interested in shipping your products, and in these we may state that we are the specialists. We are able to do a (145) good business with you with all the experience we had with others. But before we accept your proposal, it is usual with us to take up the reference named. We shall, therefore, (146) the pleasure of communicating with you further as soon as we hear from the bankers suggested. Thank you for your courtesy in making the proposal and hope we may soon be able to work with you to our mutual advantage. Yours very truly, Adam Jones (44)A.
which
B.
what
C.
in which
D.
whether
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皮皮学刷刷变学霸
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【简答题】钢材含硫量过多,高温下会发生 ,含磷量过多,低温下会发生 。 钢材中氧的含量过多,将使钢材出现 现象。
【单选题】已知H2S水溶液的Ka1⊖ =1.3×10-7 , Ka2⊖=1.3×10-15,计算S2-的Kb1⊖
A.
1.4
B.
7.7×10-8
C.
1.3×10-7
D.
1.3×10-15
【单选题】计算下列 0.10mol·L -1 Na 2 S 溶液的 PH 。已知 H 2 S 的 Ka1=1.3*10 -7 ,Ka2=7.1*10 -15
A.
12.97
B.
6.74
C.
5.27
D.
1.84
【简答题】计算 0.10mol·L -1 Na 2 S 溶液的 pH 值。已知 H 2 S 的 Ka 1 =1.3×10 -7 , Ka 2 =7.1×10 -15
【单选题】已知H2S的Ka1=8．9×10-8，Ka2=1．0×10-19，则浓度为0．050mol.L一1的H2S溶液的[S2-]为( )mol.L-1。
A.
1．0×10-7
B.
8．9×10-8
C.
6．0×10-15
D.
1．0×10-19
相关题目：
【单选题】已知H2S水溶液的Ka1⊖ =1.3×10-7 , Ka2⊖=1.3×10-15,计算S2-的Kb1⊖
A.
1.4
B.
7.7×10-8
C.
1.3×10-7
D.
1.3×10-15