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【简答题】
如图所示反馈系统，其中 。β，R i 以及F都为常数， ，写出系统函数 ，求极点的实部等于零的条件(产生自激振荡)。讨论系统出现稳定、不稳定以及临界稳定的条件，在s平面示意绘出这三种情况下极点分布图。
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反馈参考答案：
举一反三
【单选题】________ environment includes factors like economic conditions of public, economic policies of the country, and economic system.
A.
Economic
B.
Socio-cultural
C.
Political
D.
Technological
【简答题】The Audiolingual Method, known variously as the ______ Approach and the Structural Approach, influenced the way languages were taught in the US and elsewhere in the world through out the 1950s.
【简答题】后肢关节自上而下依次为 荐髂关节、_________、膝关节、_________、系关节、冠关节和_________。
【单选题】A new policy formulated, _____.
A.
thus did the economic reform begin
B.
thus began the economic reform
C.
thus had the new economic reform began
D.
began the economic reform thus
【简答题】Economic theory can direct the economic decision such as decisions about rent control, ______and minimum wage.
【单选题】There are six Economic Corridors along the Belt and Road, they are the New Eurasia Land Bridge Economic Corridor, the China-Central Asia-West Asia Economic Corridor, the China-Pakistan Economic Corrid...
A.
China-Mongolia-Russia Economic Corridor
B.
China-Korea-Russia Economic Corridor
C.
China-Japan-Russia Economic Corridor
D.
China-Korea-Japan Economic Corridor
【简答题】做功改变系统热力学状态的微观实质是 通过 转换为 。(第1、3空填 分子无规则运动的能量 或 分子有规则运动的能量)
【单选题】________ environment includes factors like economic conditions of public, economic policies of the country, and economic system.
A.
Economic
B.
Political
C.
Socio-cultural
D.
Technological
【简答题】Meanwhile, a joint economic commission would try to find out the true facts about ways of economic and industrial cooperation between companies.
【单选题】Through the economic reform, the economic situation of China _________ much better than it used to be.
A.
turned into
B.
turned off
C.
turned in
D.
turned out
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