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【单选题】
下列离子方程式书写不正确的是
A.
用小苏打治疗胃酸过多:HCO3-+H+ CO2↑+H2O
B.
.往澄清石灰水中通入过量二氧化碳:OH-+CO2 HCO3-
C.
石灰石跟硝酸反应:CO32++2H+ H2O+CO2↑
D.
铝丝放入硫酸铜溶液中 2Al + 3Cu2+ 2Al3+ + 3Cu
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举一反三
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50 cents.
B.
55 cents.
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60 cents.
D.
65 cents.
【单选题】1981年9月,()对新华社记者发表了被称为“叶九条”的谈话。
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A.
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B.
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C.
房间隔缺损时可出现固定分裂
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A.
I wish that I could help, but I have an important meeting to attend immediately.
B.
That is impossible, I have no time.
C.
You are kidding me? I Don’t you see I’m so busy today?
D.
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【单选题】听力原文:M: I want to do something tonight for a change let's go to the movies. W: In this heat? Are you joking? M: We can go to an outdoor movie. Do you think I'd suggest an indoor one in the middle of t...
A.
Their favorite movies
B.
Jokes for entertainment.
C.
Pastime for the night.
D.
Their eating habits.
【单选题】1981 年9月,( )对新华社记者发表了被称为“叶九条”的谈话。
A.
B.
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D.
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A.
正确
B.
错误
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