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【单选题】
丙酮与HCN加成的反应机理是:A.
亲核加成
B.
自由基加成
C.
亲电加成
D.
亲核取代
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【简答题】请在括号里填写划线单词的中文意思: Everyone is looking for a stylish ( ) garment.
【简答题】请在括号里填写划线单词的中文意思: The world of fashion began with individual couturiers ( ).
【单选题】This year we will produce______they did last year.
A.
as twice many cars as
B.
twice as many than cars
C.
twice as many cars as
D.
cars twice many that
【简答题】根据句意及首字母提示完成单词。 1. Last year, we v______ many interesting cities. 2. My brother likes climbing m______. 3. I think the math t______ is very difficult. 4. — Do you often p______ English with your Engli...
【简答题】请在括号里填写划线单词的中文意思: Your information will be greatly appreciated. ( )
【单选题】We have spent ______ sum of money ______ we did last year on advertising.
A.
the same as
B.
the same that
C.
such as
D.
as as
【简答题】请在括号里填写划线单词的中文意思: Perception ( ) of Body Appearance and Its Relations to Clothing
【单选题】201806 T64 We have a special surprise for you-a seven-day online promotion of all the electronic products we manufactured last year.
A.
我们有个特大的喜讯一我们将在七天之内上网展出去年生产的所有电器产品。
B.
我们给你一个特别的惊喜——在线促销我们去年生产的所有电子产品，为期七天。
C.
我们为你准备了礼物——你可凭去年购买我们公司产品的发票在七天内上网申领。
【简答题】请在括号里填写划线单词的中文意思: Male and female proportions differ only in circumference ratios ( ).
【单选题】已知 A 是矩阵,求 A 的对角矩阵 的 函数是 ( ) ,求 A 的下三角矩阵 的 函数是 ( ) 。
A.
eig (A) ,triu(A)
B.
eig(A) ,tril(A)
C.
diag(A), triu(A)
D.
diag(A), tril(A)
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