用铁皮做一个圆柱形无盖水桶,底面直径是0.5米,高是1.8米,求需要铁皮多少?以

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问题:

用铁皮做一个圆柱形无盖水桶,底面直径是0.5米,高是1.8米,求需要铁皮多少?以下几种计算方式及其结果正确的是(  )

A.3.14×0.5×1.8+3.14×0.5×0.5=3.14×(0.9+0.25)≈3.62(平方米)

B.3.14×0.5×1.8+3.14×(0.5×0.5)2=3.14×(0.9+0.9625)≈3.02(平方米)

C.3.14×0.5×1.8+3.14×0.5×0.5=3.14×(0.9+0.25)≈3.61(平方米)

D.3.14×0.5×1.8+3.14×0.5×0.5×2=3.14×(0.9+0.25)≈4.40(平方米)

考点:圆柱的表面积圆柱的体积
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竖直向上发射的小球的高度h(m)关于运动时间t(s)的函数解析式为h=at2+bt,若小球在发射后第3秒与第9秒时的高度相等,则下列时刻中小球的高度最高的是( ▲)

A、第4.2秒    B第5.8秒    C、6.4秒    D、第7.1秒

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尽管物业服务企业对成本的控制各具特色,但一般而言,有效的成本控制都应遵循的原则有( )原则。

A.可保利益

B.全面控制

C.讲求经济效益

D.责权利相结合

E.例外管理

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设备安装工程概算的编制方法不包括( )。

A.综合预算法

B.预算单价法

C.扩大单价法

D.概算指标法

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阅读短文,回答问题.

激  光

你一定见过绚丽多彩的激光吧,激光是1960年才被发现的,其特点是波长单一,高度集中,不四处扩散.1963年,有科学家用激光做了个实验:用一束激光瞄准一个红色的大气球,大气球里还有一个蓝色的小气球.激光居然穿过大气球,刺破了小气球,而大气球安然无恙.参观者弗洛克医生由此想到:能否用激光穿过角膜去封住视网膜上破裂的血管,“点焊”视网膜呢?他大胆地进行了实验,手术只用几分钟,取得了圆满成功.原来,用50W激光器照射机体,在焦点上会形成1000~1500℃的高温,焦斑周围会产生极薄的热凝固层,“焊”住了血管,阻止了毛细血管流血.这样,激光手术刀便成了医生的有力武器.

(1)文中科学家采用的激光是______.

A.红颜色           B.黄颜色        C.蓝颜色        D.绿颜色

(2)激光______(可能/不可能)是白色光.

(3)弗洛克医生在给病人修复视网膜时,是把激光的能量转化成______能.

(4)你能说出激光还有哪些应用吗?(至少举两例)

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In William Shakespeare’s play, Julius Caesar, there is major difference between two of the characters, Brutus and Mark Antony, Brutus was very honorable and Antony was very persuasive. When Brutus spoke at Caesar’s funeral, he appealed to the people’s logic and Antony spoke to the emotions of the people. Antony was very smart and used his brain frequently during the play and Brutus was very naive(天真的,率直的) about many of things.

Brutus was very honorable in the way that he always told people the truth. Antony was persuasive in the way that he used people to get whatever he wanted. For example, Antony used Lepidus to seek revenge on all of the conspirators (同谋者,阴谋者) to take the blame for their deaths. Brutus’ speech at Caesar’s funeral was very short and to the point and spoke to the logic of the people in the crowd. For example, Brutus spoke in a detached way about Caesar’s death while Antony spoke to the emotions of the crowd by crying and talking about all the good things that Caesar did for Rome. Antony’s intelligence was very apparent throughout the play and Brutus appeared to be naive about many things. Antony as smart in the way that he controlled people to his own advantage. Brutus appeared to be naive throughout the whole play because he believed everyone was as honorable as he. Brutus did not question what he was told, assuming it was always true.

In conclusion, in William Shakespeare’s play, Julius Caesar, there is a major difference between the two characters, Brutus and Mark Antony. The strongest contrast between the two characters appears to be their ability and inability to be both honorable and persuasive.

46. The author wrote this passage by _____

A. number             B. contrast                    C. question                   D. narration

47. A lot of difference is mentioned in the passage between _____

A. Shakespeare and Antony                   B. Julius and Antony

C. Brutus and Antony                                D. Julius and Brutus

48. Which of the following adjectives can be used to describe Antony’s character?

A. Honorable and naïve                       

B. Persuasive and smart

C. Honorable and smart              

D. Simple and frank

49. What’s the Chinese meaning of the underlined “to the point”?

A. 离题的                   B. 中肯的             C. 优美的                    D.动听的

50. From the passage, we can conclude that ______

A. Shakespeare was a great scientist         

B. Shakespeare was a well-known musician

C. Shakespeare was a famous artist      

D. Shakespeare was a famed playwright

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