如图所示,沿x轴正方向传播的一列横波在某时刻的波形图为一正弦曲线,其波速为200

题型:不定项选择

问题:

如图所示,沿x轴正方向传播的一列横波在某时刻的波形图为一正弦曲线,其波速为200m/s,下列说法正确的是

[ ]

A.从图示时刻开始,质点b比质点a先到平衡位置

B.从图示时刻开始,经0.01s质点a通过的路程为0.1m

C.若该波传播中遇到宽约3m的障碍物能发生明显的衍射现象

D.若该波波源从O点沿x轴正向运动,则在x=2000m处接收到的波的频率小于50Hz

考点:波的图像
题型:不定项选择

阅读理解。

Dear Mom and Dad,

      I'm afraid I have some very bad news for you. I have been very naughty and the school master is very

angry with me. She is going to write to you. You must come and take me away from here. She does not

want me in the school any longer. The trouble started last night when I was smoking a cigarette in bed. As

I was smoking, I heard footsteps coming towards the room. I did not want a teacher to catch me smoking,

so I threw the cigarette away.

       Unfortunately, the cigarette fell into the waste-paper basket. It caught fire.

       There was a curtain near the waste-paper basket. It caught fire too. Soon the whole room was burning.

The master phoned the fire brigade. The school is a long way from the town and before the fire brigade

arrived, the whole school was on fire. The master said that the fire was all my fault and I must pay for the

damage. She will send you a bill for about a million dollars. I'm very sorry for this.

                                                                                                                                      Much love 

                                                                                                                                      Sarah

1. Why did Sarah write to his parents? [ ]

A. He missed them very much for they hadn't seen each other for a long time.

B. He told his parents what he had done in school.

C. He was tired of studying, and wanted to leave school.

D. He thought he was old enough to help them do something.

2. Where did Sarah smoke? [ ]

A. In the classroom.

B. In the dinning hall.

C. In the street.

D. In the dormitory.

3. Why was the school master angry with him? [ ]

A. Because he was too naughty.

B. Because he was too lazy.

C. Because he caused a big fire.

D. Because he stole something from the school.

4. According to the passage, what should the students not do? [ ]

A. They should not smoke, because smoking is dangerous to them.

B. They should not dance, because dancing would waste a lot of mone

C. They should not make friends, because making friends would take them absen

D. They should not wear expensive clothes because they would waste money.

题型:不定项选择

顾恺之提出“迁想妙得”思想的含义,是提倡画家与()之间主与客的互相联系。

题型:不定项选择

以下哪些方式不是降低学生内在儿童过强表达的策略()

A.自然后果的呈现

B.多了解人和人之间的巨大差异,而不是“求同”

C.多增加情绪感知、情绪表达经验

D.使后果变重一些,使孩子要恐惧这个后果

题型:不定项选择

介绍药物名称、性状、药理及应用、用法、用量等的药品集类是

A.《药名检索辞典》

B.《中国药学文献》

C.《新编药物学》

D.《中国药典》(2000版)

E.《药物研究》

题型:不定项选择

证券公司从事证券自营业务,其投资范围或者投资比例违反《证券公司监督管理条例》的相关规定,负责的主管人员和其他直接责任人员,应处以()的罚款。

A.3万元以上10万元以下

B.10万元以上

C.1万元以上3万元以下

D.3万元以上5万元以下

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