The CN Tower is a bit taller than the Oriental Pearl TV Tower in Shanghai

听力原文：W: Did you visit CN Tower when you had your vacation in Toronto last summer？

M: I didn't make it last June. But I finally visited it two months later. I plan to visit it again sometime next year.

Q: What do we learn about the man？

(13)

A．He saw CN Tower he visited on TV.

B．He has visited CN Tower twice.

C．He has visited CN Tower once.

D．He will visit the CN Tower in June.

A.The Niagara Falls

B.The CN Tower

C.Jasper National Park

D.The Air Canada Center

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设a₁，a₂，…，a_n+1是n+1个不同的数，b₁，b₂，…，b_n+1是任意n+1个数，而多项式

有以下性质：f(a_i)-b_i(i=1，2，…，n+1)． 用线性方程组的理论证明，f(x)的系数c₀，c₁，…，c_n是唯一确定的，并且对，n=2的情形导出拉格朗日插值公式．

以实现一个递归滤波器。为此，考虑示于图11-55(b)中的结构，其中H(z)是图11-55(a)的非递归线性时不变系统的系统函数。试求该反馈系统总的系统函数，并求出关于整个系统输入和输出的差分方程。

(b)现在假定图11-55(b)中的H(z)是一个递归线性时不变系统的系统函数，这是假设

证明：如何能求得系数K，c₁，...，c_n和d₀，...，d_N的值，使得闭环系统函数为

其中a_i和b_i都是已给定的系数。

A.River, Sky and Tower

B.Painting of Tower beside the River

C.Tower under the Sky beside the River

D.Tower on the Mountain Overlooking the River

A、Jin Mao Tower

B、Shanghai Tower

C、Shanghai World Financial Center

D、the Oriental Pearl Tower