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反馈系统又称（）系统，其控制作用是通过（）量与反馈量的差值进行的。

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要减小系统的超调量，就要增大系统的（），但是会引起（）变大，影响系统的快速性。

线性定常系统稳定的充要条件是（）。

二阶线性控制系统的单位阶跃响应呈现等副振荡，则其阻尼比ζ为_________。

After World War II broke out, the Nazis pursued their plan to take control of Europe. On April 9, 1940, the Nazi army (1)__Denmark, a country of those who, according to Nazi racial theories, had the same Aryan (2). Officially Nazi Germany (3)_to be protecting Denmark against Britain.Denmark did not fight Nazi Germany. By cooperating under false(4)__, the Danish government had a good relationship with Nazis. In this way, it hoped to protect Danish lives and cultural (5)for as long as possible.The angry people of Denmark used their brains to resist the Nazi occupation. They had strikes to stop the production of German war materials. They had students refuse to speak German in language classes. They even had Danish songfests (歌咏大会) (6)_the nation to show strength and unity (团结). In the fall of 1943, Nazi troops arrived to round up and send all Danish Jews to concentration camps outside Denmark. The Danes created a secret system for saving the lives of Jewish citizens. Jewish families (7)__to the villages on the coast, before fishing boats helped them escape to safety in Sweden. Through a combination of all of these (8)acts of resistance, the power and unity of the Danes pushed back the Nazis. For Danish Jews, it was a (9)_that only around 500 were sent to a concentration camp and 7550 (10)___. Denmark was, therefore, the only European country to save almost all of its Jewish citizens from the Holocaust.A.cancelled B. claimed C. contest D. fled E. identityF.invaded G. miracle H. numerous I. origins J. pretensesK.remarkable L. submitted M. surged N. survived O. throughout