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计算题： 称取经180度干燥2h的优级纯碳酸钠0.5082g，配制成500ml碳酸钠标准溶液用于标定硫酸溶液，滴定20.0ml碳酸钠标液时用去硫酸标液18.95ml，试求硫酸溶液的浓度（硫酸钠的摩尔质量为52.995）。
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举一反三
【单选题】Why is the mother of the narrator almost cry from joy when seeing the sceneries?
A.
Because they remind her of her lost husband
B.
Because they are painted by her husband
C.
Because they are cheap
D.
Because they are pretty
【多选题】In “The Egg”, what has happened to the young couple, when the narrator is born into the world?
A.
they grow anxious and pessimistic about their future.
B.
they become ambitious
C.
they are possessed by the desire to get up in the world
D.
they bear high aspirations for the narrator
【单选题】When the narrator was young, ___________.
A.
he used to toss all the coins he had into a pickle jar
B.
he used to like making sounds by dropping coins into a pickle jar
C.
his father used to save all the coins he had
D.
his father used to give him all the coins he had
【单选题】Which of the following is true when the narrator watched the TV program about the cathedral?
A.
The blind man was falling asleep.
B.
The blind man was listening to the program.
C.
The blind man asked the narrator to tell him what was on TV.
D.
The blind man was talking to the narrator ' s wife.
【单选题】The experience the narrator had when winning the class oratorical competition made her realize that______.
A.
she was perhaps to be blamed for her loneliness
B.
her classmates really didn't like her at all
C.
there was a lot of prejudice against Indians
D.
it was very easy to win an oratorical contest
【单选题】When the narrator was young, ___________.
A.
he used to toss all the coins he had into a pickle jar
B.
he used to like making sounds dropping coins into a pickle jar
C.
his father used to save all the coins he had
D.
his father used to give him all the coins he had
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