(填空题) 已知输入信号x(t)=30cos(30t+30º)，此时有一阶装置的A(w)=0.87, ψ(w)=-21.7 º，则该装置的稳态输出表达式为___

>> 高等教育 / 传感器与检测技术

积分

参考答案：

点击查看答案

佳题速递：

Yellow fever is a disease in warm lands that is found mainly along the shores of the Atlantic Ocean. It was first noticed in America, but may have come from Africa and reached the New World soon after Columbus. Yellow fever was one of the most feared diseases in the United States, where many died in repeated outbreaks. An outbreak, which was to lead to surprising development, was one that happened in Cuba during the Spanish-American War. An army group under Walter Reed was sent there in June 1900 with orders to give special attention to questions about the cause and prevention of yellow fever. In many experiments, he proved the truth of an idea advanced in 1881 by a Cuban doctor that the city type of mosquitoes passed on the disease. They are born in pools of quiet and warm water, within a short distance of people's homes. So a general came to Havana with orders from the United States government to dry up these pools. He carried out the task so well that the mosquitoes disappeared. Yellow fever never returned to Havana. A few years later the same general successfully repeated this operation in Panama and in this way made the building of the Panama Canal possible. It all seemed so simple. End the mosquitoes, end the disease. Man even began to dream of getting rid of yellow fever from the world. (1)According to this passage, yellow fever mainly broke out in the following places EXCEPT _ _ _ _ _ _ _ _ .（2分）A、AmericaB、CubaC、AlgeriaD、England(2)Who first began to research the disease?（2分）A、An American generalB、Walter ReedC、A Cuban doctorD、A Cuban general(3)An army group was sent to Cuba in June 1900 in order to _ _ _ _ _ _ _ .（2分）A、get rid of yellow fever B、build the Panama CanalC、look into the cause of yellow feverD、A and C(4)According to the passage, yellow fever _ _ _ _ _ _ _ .（2分）A、was carried to the New World by ColumbusB、made the building of the Panama Canal difficultC、only broke out once in a yearD、is a disease which is passed on by all kinds of mosquitoes(5)We can conclude _ _ _ _ _ _ _ _ from the passage.（2分）A、man has known the cause of yellow fever but doesn''t know how to get rid of itB、man has known the cause of yellow fever and gotten rid of it from the worldC、man hasn''t known the cause of yellow fever exactly and there was a long wayD、man has known the cause of yellow fever and has achieved some success.新发展英语综合教程（二）

[论述题] 侵害隐私权排除的抗辩理由职业道德与法律基础

(单选题) _ _ _ _ _ many times, but he still couldn’t understand it.( ) A、Having been toldB、Though he had beenC、He was toldD、Having told大学英语3

布坎南提出的“俱乐部物品”是属于准公共物品的范畴政府经济学

[多选题] 胰岛素对糖代谢的调节形式有：（） A.促进组织对葡萄糖的摄取和利用 B.抑制葡萄糖合成糖原 C.促进葡萄糖转变为脂肪酸 D.?抑制糖异生运动生理学

[综合题] 现有模数2.3的水玻璃5.5吨，若全部把它们配成模数为2.7的，需模数为2.9的水玻璃多少公斤？装配式建筑