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【简答题】
用间接碘量法测定BaCl 2 的纯度时，先将Ba 2+ 沉淀为Ba(IO 3 ) 2 ，沉淀经洗涤后溶解并酸化，加入过量的KI，然后用Na 2 S 2 O 3 标准溶液滴定，则BaCl 2 与Na 2 S 2 O 3 的计量关系为，n(BaCl 2 )：n(Na 2 S 2 O 3 )是______。
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举一反三
【单选题】You can _____ yourself _____ an opinion freely at the class meeting.A．take; onB．declare; ofC．del
A.
93. You can _____ yourself _____ an opinion freely at the class meeting. A．take; on
B.
declare; of
C.
deliver; of
D.
deliver; out
【单选题】You can ______________ the replacement tickets to board the train and declare to the railway staff.
A.
give
B.
hold
C.
show
D.
present
【单选题】You can hold the replacement tickets to _____________ the train and declare to the railway staff.
A.
change
B.
miss
C.
catch
D.
board
【简答题】You can hold the replacement tickets to ______________(豋车) the train and declare to the railway staff.
【简答题】You can ____________(持有,拿着) the replacement tickets to board the train and declare to the railway staff.
【简答题】Then you can hold the replacement tickets to board the train and declare to the railway staff.
【简答题】You can hold the replacement tickets to ____________(登车) the train and declare to the railway staff.
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