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【简答题】
计算0．20mol／L H2C2O4溶液的pH值。[H2C2O4的Ka1＝5．9×10-2， Ka2＝6．4×10-6
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【单选题】听力原文：M: If you are in a hurry, you can take the subway. If you want to go sightseeing, take a bus. W: Actually I don't have to be at the conference before noon. Q: What will the woman probably do? (13...
A.
She will take the subway.
B.
She will hurry to the conference.
C.
She will skip the conference and go sightseeing.
D.
She will take a bus.