下图给出了四种幅频特性的滤波电路,若输入为 输入 u i =sin(0.01 ω L t)+ sin ω 0 t+si n(100 ω H t ) 信号,其中 ω L =0.01ω 0 , ω H =100ω 0, 该ui信号经某电路后,忽略滤波后的残余部分,其输出为 u 0 = sin ω 0 t ,则ui信号经过电路的幅频特性可能是()
【单选题】The world price of a pound of T-bone steak is $9.00. Before Latvia allowed trade in beef, the price of a pound of T-bone steak there was $7.50. Once Latvia began allowing trade in beef ...
A.
exporting T-bone steak and the price per pound in Latvia remained at $7.50.
B.
exporting T-bone steak and the price per pound in Latvia increased to $9.00.
C.
importing T-bone steak and the price per pound in Latvia remained at $7.50.
D.
importing T-bone steak and the price per pound in Latvia increased to $9.00.