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【简答题】
上面函数 在x=1处切线斜率或者说导数已经由上题求出,那么 请写出经过这一点的切线方程。 思路:先得到(1, f(1)), 然后使用已经求得的斜率f'(1), 然后由一点加斜率求直线方程的方法: y-f(1) = f'(1) (x-1), 直接代入,把完整的方程写出来
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【单选题】NAD + 和 NADP + 结构中有相同之处 ,故在下列哪一波长时,其吸收峰相同
A.
260nm
B.
360nm
C.
280nm
D.
370nm
E.
300nm
【判断题】"The 11th Hour” is used to describe the final moments of a given event, or situation right before a deadline.
A.
正确
B.
错误
【单选题】There is _____ 'h' and _____ 'u' in the word 'hour'. [ ]
A.
a; a
B.
an; a
C.
an; an
D.
a; an
【单选题】There is ____________ ' h ' and ____________ ' u ' in the word ' hour '. [ ]
A.
a, a
B.
an, an
C.
a, an
D.
an, a
【单选题】There is ________”h” and ________”u” in the word “hour”.
A.
an ; a
B.
a ;an
C.
a ; a
D.
an; an
【单选题】There is _____'u' and _____'r' in the word 'hour' [ ]
A.
an, a
B.
a, an
C.
a, a
D.
an, an
【单选题】听力原文： The terrible destruction of the World Trade Center, on September 11th 2001, has united the States in a way that they have not known for many years. It has also united most of the world. We will ...
A.
2
B.
3
C.
4
D.
5
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