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【单选题】
已知 : Cr 3+ + e = Cr 2+ E o = -0.41 0 V Pb 2+ + 2e = Pb E o = -0.126V Cu 2+ + e = Cu E o = +0.158V Fe 3+ + e = Fe 2+ E o = +0.771V 则在标态下 , 下列氧化剂中仅能氧化 Cr 2+ 而不能氧化 Pb 、 Cu 、 Fe 2+ 的是:A.
Cu 2+
B.
Fe 3+
C.
Pb 2+
D.
无
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反馈参考答案：
举一反三
【简答题】A．Those who have heart attacks. B．Those who desire to lose weight. C．Those who have spare time. D．Those who have inactive jobs.
【单选题】—Hi, can I help you? —_____. [ ]
A.
Yes, please
B.
No, I can't
C.
Yes, I can
D.
You are welcome
【单选题】Can I help you?
A.
Yes, you can.
B.
Yes, thank you all the same.
C.
Yes, I'm looking for a sweater.
D.
Yes, thank you.
【单选题】—__________? —Yes, please. I want a sweater. [ ]
A.
Can I help you
B.
Can you help me
C.
Do you want a sweater
D.
What do you want
【单选题】Who would like to visit Kauai?
A.
Those who love nature.
B.
Those who love city life.
C.
Those who love the comfort in a fine hotel.
D.
Those who love going shopping.
【单选题】— Can I help you? — _____ I want a sweater. [ ]
A.
No, thanks.
B.
Yes, you can.
C.
Yes, please.
【单选题】听力原文：Good morning. Can I help you? (4)
A.
Yes, I think you can help me out.
B.
No, I cannot do it for you now.
C.
Yes, I'd like to try that jacket.
D.
No, I don't like that jacket at all.
【简答题】A．Those who have more leisure time. B．Those who have heart attacks. C．Those who have erous jobs. D．Those who have inactive jobs.
【单选题】—Can I help you? —________. [ ]
A.
Yes, I can
B.
Yes, please
C.
No, I can't
D.
Yes, I do
相关题目：
【单选题】—Hi, can I help you? —_____. [ ]
A.
Yes, please
B.
No, I can't
C.
Yes, I can
D.
You are welcome
【单选题】— Can I help you? — _____ I want a sweater. [ ]
A.
No, thanks.
B.
Yes, you can.
C.
Yes, please.
参考解析：
知识点：
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