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【单选题】
下列分子中只有σ键的化合物是()A.
乙烷
B.
乙烯
C.
乙炔
D.
CH 2 =CH-CH=CH 2
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举一反三
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【单选题】若有以下数组说明，则i=10;a[a[i]]元素数值是int a[12]={1,4,7,10,2,5,8,11,3,6,9,12};
A.
6
B.
10
C.
9
D.
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E.
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【单选题】You can use which of the following expressions to assist the guest to pay the bill?
A.
Good evening, what is your pleasure, sir?
B.
Just a moment please, I will calculate that for you. Thank you for your waiting, sir. Your bill comes to ...
C.
How would you like your steak done?
D.
We hope to have another opportunity to serve you again.
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