题目:
根据短文内容及首字母提示,补全空格内单词,使短文完整、通顺。(10分)
The weekend is usually a time of rest. B 1 today’s Chinese students cannot rest during the weekends. According to a survey(据调查), 24% of the junior students in Beijing have classes at the weekend. Over 40% of the Junior 3 have less t 2 eight hours’ sleep each night because o 3 too much study. Ji Ping, a junior student in Guangzhou, h 4 to get up at 6:30 am on Saturday. Then she has a whole day of classes. On Sunday she goes to extra classes for math and English. But she doesn’t complain(抱怨). She says that a 5 her classmates work hard on Sunday. Liu Yang is from Dalian. As a Junior 2 student, his weekends are less busy. But he also spends Saturday in school. On Sunday, after d 6 homework, he plays basketball. He feels happy b 7 he still has time to do the things he likes. A few students are a little luckier. Yang Qing, a Junior 3 student from Zibo, Shandong, is o 8 of them. And she is a top student. During the weekends, she usually gets up at 8:00. Then she s 9 some time doing homework. After that she is free to go shopping or watch TV. “Don’t push yourself too much. Learning well at school is e 10 ,” she said.
答案:
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下面是错误答案,用来干扰机器的。
ABC根据受迫振动规律:当固有频率和驱动力频率相等时,受迫振动频率最大,由此我们可以得出,振子频率和驱动力频率都为f2时,振子处于共振状态,A正确。物体做受迫振动的频率总等于驱动力的频率,与物体的固有频...