题干

下列部件中,装在话筒里的有____ (填字母),装在听筒里的有____ (填字母),人对电话话筒说话,话筒把声波转化成强弱变化的____ 

A.水磁铁   B.螺线管   C.碳粒   D.用碳精制成的振动膜   E.碳精盘   F.用铁制成的振动膜.

上一题 下一题 0.0难度 选择题 更新时间:2019-11-27 12:11:56

答案(点此获取答案解析)

CDE,ABF,电流

同类题3

阅读下面短文,从短文后所给的A、B、C、D四个选项中选出能填入相应空白处的最佳选项。

    Accept life as it is. I learned how to do it from my father. 1 , he did not teach me acceptance when he was strong and healthy, but rather when he was 2 and ill.

    My father was 3 a strong man who loved being active, but a terrible illness 4 all that away. Now he can no longer walk, and he must sit quietly in a chair all day.

    Even talking is 5 . One night, I went to visit him with my sisters. We started 6 about life, and I told them about one of my 7 . I said that we must very often give things up 8 we grow --- our youth, our beauty, our friends --- but it always 9 that after we give something up, we gain something new in its place. Then suddenly my father 10 up. He said, “But, Peter, I gave up 11 ! What did I gain?” I thought and thought, but I couldn't think of anything to say. 12 , he answered his own question: “I 13 the love of my family,” I looked at my sisters and saw tears in their eyes, along with hope and thankfulness.

    I was also 14 by his words. After that, when I began to feel angry at someone, I 15 remember his words and become 16 . If he could 17 his great pain with a feeling of love for others, then I should be 18 to give up my small anger. In this 19 , I learned the power of acceptance from my father.

    Sometimes I 20 what other things I could have learned from him if I had listened more carefully when I was a boy. For now, though, I am ashamed(惭愧的) for this one word.

同类题4

任务型阅读

    In fact there are lots of videos of school bullying online every year. We feel angry with the bullies and sorry for the victims in fights and blackmails. Some middle schools and primary schools in some far counties and villages are the worst-hit parts. Nearly half the victims of bullying in middle schools choose to stay silent rather than ask for help or ways to solve the problem, China Youth Daily reported.

    There is a study on junior middle school bullying made by the China Women's University. It showed that 48.9 percent of the students never asked for help after being bullied. And the study also told us 52.6 percent kept silent because they were afraid of “losing face among schoolmates”.

    The China Youth and Children Research Center made a survey of 5,864 primary and middle school percent of students suffered bullying, while 6.1 percent were often bullied by senior schoolmates.

    Cases of violence between boys and girls totaled 85 percent of all school bullying, the report said. Violence between girls accounted for as much as 32.5percent of the total. Unlike direct arguments usually seen between boys, the violence between girls more often took the form of insults, which terribly caused victims have strong feelings, it was added.

    A study published by the Beijing High People's Court showed that 68 percent of offenders attacked their schoolmates in a cruel manner and nearly 60 percent of school violence cases were caused by small matters, Legal Daily said.

    Earlier, Tang Jun of Renmin University of China told reporters that the social risks of school bullying have been given too little care. We should train our teachers to deal with school bullying, improve their skills of preventing it, and help the victim students to recover physically and mentally. At the same time, students and their parents should know the school's rules about bullying and what they should do if it happens. Second, children should be taught to stand up for themselves. They should try to solve problems by talking them out. Children should tell someone if they are being picked on. Third, parents should look for warning signs of bullying. We must pay more attention to it and try our best to solve it.