题目内容

δ(t)sin(t) δ(t)的结果为( )

A. δ(t)
B. δ(2t)
C. sin(t)
D. cos(t)

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x(t+6)*h(t-2)等于( )

A. x(t)*h(t)
B. x(t)*h(t-4)
C. x(t)*h(t+4)
D. x(t-6)*h(t+2)

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线性常系数微分方程表示的系统,方程的齐次解称之,特解称之。

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[单选]Which of the following statements is correct?

A. Both a competitive firm and a monopolist are price takers.
Both a competitive firm and a monopolist are price makers.
C. A competitive firm is a price taker, whereas a monopolist is a price maker.
D. A competitive firm is a price maker, whereas a monopolist is a price taker.

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[单选]A monopoly market is characterized by

A. many buyers and sellers.
B. “natural” products.
C. barriers to entry.
D. a Nash equilibrium.

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δ(t)*sin(t) *δ(t)的结果为( )

A. δ(t) B. δ(2t) C. sin(t) D. cos(t)

x(t+6)*h(t-2)等于( )

线性常系数微分方程表示的系统,方程的齐次解称之____,特解称之____。

[单选]Which of the following statements is correct?

[单选]A monopoly market is characterized by

δ(t)sin(t) δ(t)的结果为( )

A. δ(t)
B. δ(2t)
C. sin(t)
D. cos(t)

线性常系数微分方程表示的系统,方程的齐次解称之,特解称之。