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【单选题】
函数在 点有定义是有极限的 ( ) .A.
充分条件
B.
充要条件
C.
既不是充分条件，也不是必要条件
D.
必要条件
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皮皮学刷刷变学霸
举一反三
【简答题】基于不同的来源,斯威勒尔将认知负荷分成了 ( ) 、 ( ) 和 ( ) 三种。
【单选题】The writer states that, until recently, Americans thought of their country as a ______.
A.
source of enlightenment
B.
leader in technological progress
C.
recipient of a European heritage
D.
peacemaker
【简答题】We thought that he is a (journal) ______, but he actually is a writer.
【单选题】The man sitting in his car thought the writer and her husband finished shopping in ten minutes.
A.
Right
B.
Wrong
C.
Doesn't Say
【简答题】y=(1-x 2 ) 100 求导数
【简答题】解下列方程组． （1） 7x+5y ① y=x+3 ② （2） 3x-2y=5 ① x+2y=13 ② （3） 2(x+1)-3(y-1)=10 ① 2(x+1)+7(y-1)=20 ② （4） 2x-y 5 = x+y 3 =3 （5） 3(x-1)-2(2y-1)=7 ① x+2 3 - 1-y 2 =2 ② （6） 25x+17y=91 ...
【简答题】若x、y满足 0≤x≤2 0≤y≤2 x-y≥1 ，则（x-1） 2 +（y-1） 2 的取值范围是______．
【单选题】The writer thought __________.
A.
he had lost his money
B.
someone had stolen his money
C.
the manager had the money
D.
the girl had stolen the money
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