题目内容
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_________。
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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
1956年党的()召开，标志着党对中国社会主义建设道路的探索取得初步成果。
党的八大正确分析国内形势和国内主要矛盾的变化,明确提出党和全国人民在新形势下的主要任务。以下哪项关于八大内容的表述错误?
我国第一颗原子弹爆炸成功的时间是()。
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