如图是某实验小组探究“斜面机械效率与斜面的倾斜程度的关系”的实验装置。实验时它们

题型:探究题

问题:

如图是某实验小组探究“斜面机械效率与斜面的倾斜程度的关系”的实验装置。实验时它们用弹簧测力计拉着同一物块沿粗糙程度相同的斜面向上做匀速直线运动。实验部分数据如下表:

(1)在第1次实验中,弹簧测力计的示数为图所示,此时拉力为___________N。

(2)在第2次实验中,斜面的机械效率为_____________

(3)分析表格中的数据还可以得出结论:在斜面粗糙程度相同时,斜面越陡,机械效率越__________(填“高”或“低”)。

(4)分析表格中的实验数据还可推知:在高度相同时,斜面越长越____________(填“省力”或“费力”)。

考点:斜面的机械效率弹簧测力计的使用与读数其他简单机械:轮轴和斜面
题型:探究题

Beijing Opera is also called Peking Opera. It came into being after 1790 when the famous four Anhui opera troupes(戏班) came to Beijing. Its music and singing(唱腔) come from Xipi and Erhuang in Anhui and Hubei. Its costumes are all fascinating and artistic. It is the highest expression of the Chinese culture. It’s full of famous stories, beautiful facial paintings, and wonderful gestures and fighting. This kind of opera is very popular with Chinese people.

There are four main roles in Beijing Opera: Sheng, Dan, Jing and Chou. Sheng is the leading male(男性) actor. For example, a Wusheng is a soldier or fighter. A Xiaosheng is a young man. A Laosheng is an old man. Dan is the female(女性) role. Jing, mostly male, is the face-painted role and Chou is the comedy actor or clown.

Stories in Beijing Opera are very interesting. Some of them are from the history book, but most of them are from the literature, especially famous novels. The people in the story usually have some disagreements. They become angry and unhappy. They are sad and lonely. Sometimes they are nervous and worried. Then they find a way to make peace. The stories usually end with happiness and laughter and people are all happy in the end.

小题1:Beijing Opera’s singing is from ____________.

A.Anhui and Hubei

B.Beijing and Anhui

C.the history book

D.the literature and novels小题2:The second paragraph of the reading is about the _________ of Beijing Opera.

A.stories

B.roles

C.gestures

D.paintings小题3:From the reading, we know the role Chou most probably has a (n) _________ feature.

A.honest

B.funny

C.dull

D.serious小题4:Which of the following is the role Sheng?

A.

B.

C.

D.小题5:Which of the following statements is TRUE?

A.Peking Opera is full of different gestures.

B.There are only four roles in Beijing Opera.

C.Beijing Opera is the most popular in the world.

D.The people in the story usually are in agreement.

题型:探究题

(三)甲城市至乙城市的高速公路即将贯通,经过市场调查与预测,甲、乙两城市之间的年日均班车客运量将达1680人次,由于两城市经济发展水平相当,往返客运量基本平衡。两城市运输距离为250千米。预期正式运行后车辆当日往返,平均车日行程500千米,运营车辆的单车额定载客量为50人。为了规范旅客运输市场经营秩序,以车辆工作率为80%、车辆实载率为70%的效率指标作为控制参营车辆数量的依据。

参营客车在甲、乙城市之间往返行驶,这种客车运行组织方式属于______。

A.定线运行方式

B.定线包乘运行方式

C.大循环运行方式

D.小循环运行方式

E.循环包乘运行方式

题型:探究题

因为面膜质量投诉的人中大多数是女性说明()

A、面膜更容易伤害女性皮肤

B、使用面膜的女性比男性多

C、面膜是无效的化妆品

D、以上选项都不对

题型:探究题

在地面天气图上用来表示天气区的主要颜色有哪些?各表示什么天气现象?

题型:探究题

1949年1月至9月享受实物薪金制待遇的干部,能办理离休吗?

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