(T/F) The railroad transport is capable of offering low-cost means of carrying bulky, low-value products.
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设f(t)为因果信号,已知 f(t)*f&39;(t)=(1-t)e-tε(t) 求f(t)。
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若f(t)的奈奎斯特角频率为ωn,则f(t)+f(t一tn)的奈奎斯特角频率为__________,f(t)COS(ω0。t)的奈奎
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In cities across the United States, old factories, warehouses, schools railroad stations and other buildings are being renovated for new uses.City planners and private investors are finding the good buildings, no matter how old, can be remodeled for new purposes.“If you’d asked someone four or five years ago whether he’d rent an apartment in an abandoned piano factory of clothing warehouse, he’d have thought you were crazy,” says a New York architect.“Today, many people are eager to do it.” The renovating may include a former city hall or courthouse changed into offices; a bank or church changed into a restaurant; or , as in Plains, Georgia, a railroad station used as a center for a presidential campaign.
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The committee for local development asked that the new highway______along-side the railroad.
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若f(t)=证明f(t)=f(1/t).
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证明f(t)δ"(t)=f(0)δ"(t)-2f&39;(0)δ&39;(t)+f"(0)δ(t)。
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若F<sub>1</sub>(ᵚ)=F[f<sub>1</sub>(t)],F<sub>2</sub>(ᵚ)=F[f<sub>2</sub>(t)],证明 。
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A fast railroad train,traveling 96 kilometers an hour,takes more than 48 hours to cross the country.
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对于一系统的输入输出关系为y(t)=f(3-t)-f(t-1),f(t)为输入,y(t)为输出,试问:该系统是__()
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