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综合题目 在等差数列 { a n } 中, a 4 = 10 ,且 a 3 , a 6 , a 10 成等比数列,求数列 { a n } 前 20 项的和 S 20 .
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参考答案:
举一反三
【多选题】电子商务的主要类型可以分为()。
A.
B-B型
B.
B-C型
C.
C-C型
D.
B-G型
E.
C-G型
【单选题】按服务对象划分的医院是
A.
全民所有制医院
B.
二级医院
C.
企业医院
D.
专科医院
E.
综合性医院
【简答题】_______ ( 我能听音乐会的唯一办法 ) is if I get this done in time
【单选题】—______ bad weather!—Yes, but it’s going to be fine soon, I think.
A.
How
B.
What a
C.
How a
D.
What
【简答题】Butit’s going to be_______ difficult to check that a piece of timber that you buyin a market here.A. organizationally B. significantly C. extraordinarily D. additionally
【单选题】以下在法拉第效应实验中,不会用到的组件是( )。
A.
电磁线圈
B.
旋光玻璃
C.
光电探测器
D.
光纤
【简答题】曲柄摇杆机构产生“死点”位置的条件时摇杆作为__________,曲柄为__________。
【简答题】Dear World, My son starts school today. It’s going to be strange and new to him for some time. And I wish you would treat him gently. You see, up to now, he has been king of his own room. He has been ...
【简答题】阅读理解。 Dear World, My son starts school today. It’s going to be strange and new to him for some time. And I wish you would treat him gently. You see, up to now, he has been the king of his own room. He...
【简答题】曲柄摇杆机构产生“死点”位置的条件时摇杆为(),曲柄为()。
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