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烷基化反应历程包括叔丁基正碳离子的生成、C8正碳离子的生成、C8正碳离子的和氢转移形成C8烷烃A.
正确
B.
错误
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【简答题】请用括号里给出词的正确形式填空: He liked her and she felt (comfort) with him.
【简答题】He
liked her and she felt
with him (comfort).
【简答题】设数列 前 项和为 , 满足 . （1）求数列 的通项公式; （2）令 求数列 的前 项和 ; （3）若不等式 对任意的 恒成立，求实数 的取值范围.
【简答题】函数 . （1）求 的解析式； （2）求证：函数 为奇函数； （3）若实数 满足: , 求 的取值范围
【单选题】求取满足式 1*1+2*2+3*3+ ...... +n*n ≤1000的n,正确的语句是____。
A.
for(i=1,s=0;(s=s+i*i)<=1000;n=i++) ;
B.
for(i=1,s=0;(s=s+i*i)<=1000;n=++i) ;
C.
for(i=1,s=0;(s=s+i*++i)<=1000;n=i) ;
D.
for(i=1,s=0;(s=s+i*i++)<=1000;n=i) ;
【单选题】She was slim and he liked her that way. So he called a lawyer. The result was a contract. According to the document, the fresh-faced bride agreed to pay a fine for each pound she gained in weight, the...
A.
is a part of a comedy film
B.
is something rare
C.
is something real and becoming common daily
D.
is ridiculous
【简答题】She was slim and he liked her that way. So he called a lawyer. The result was a contract. According to the document, the fresh-faced bride agreed to pay a fine for each pound she gained in weight, the...
【单选题】求取满足式 1 2 +2 2 +3 2 + ...... +n 2 ≤1000的n,正确的语句是( )。
A.
for(i=1,s=0;(s=s+i*i)<=1000;n=i++) ;
B.
for(i=1,s=0;(s=s+i*i)<=1000;n=++i) ;
C.
for(i=1,s=0;(s=s+i*++i)<=1000;n=i) ;
D.
for(i=1,s=0;(s=s+i*i++)<=1000;n=i) ;
【简答题】已知定义在 上的函数 是偶函数，且 时， . (1)当 时，求 解析式； （2）当 ，求 取值的集合. （3）当 ，函数的值域为 ,求 满足的条件。
【单选题】She was slim and he liked her that way. So he called a lawyer. The result was a contract. According to the document, the fresh-faced bride agreed to pay a fine for each pound she gained in weight, the...
A.
is a part of a comedy film
B.
is something rare
C.
is something real and becoming common daily
D.
is ridiculous
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