车轮磨耗型踏面与()踏面相比,磨耗型可以减少踏面的磨耗,有助于改善车辆的曲线通过性能

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问题:

车轮磨耗型踏面与()踏面相比,磨耗型可以减少踏面的磨耗,有助于改善车辆的曲线通过性能。

考点:检车员考试货车检车员技师货车检车员技师题库
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《中国药典》2005年版的一部收载的为中药材和中成药,二部为()、抗生素及其制剂,三部为生物制品。

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创新思维是一种()的过程处在不断的运动变化之中它会因自身的运动变化而相应地发生结构性的变化表现为自身变换的灵活性。

A、静态

B、动态

C、主观

D、客观

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实验技术

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中气相色谱法测定公共场所空气中一氧化碳时,一氧化碳在镍触媒催化下,与氢气反应,生成()。

A.乙烯

B.乙烷

C.乙炔

D.甲烷

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In the absence of optimism, we are left with nothing but critics, naysayers, and prophets of doom. When a nation expects the worst from its people and institutions, and its experts focus exclusively on faults, hope dies. Too many people spend too much tie looking down rather than up, finding fault with their country’s political institutions, economic system, educational establishment, religious organizations, and—worst of all—with each other.

Faultfinding expends so much negative energy that nothing is left over for positive action. It takes courage and strength to solve the genuine problems that afflict every society. Sure, there well always be things that need fixing. But the question is, do you want to spend your time and energy tearing things down or building them up

The staging of a Broadway show could illustrate my point. Let’s say a new production is about to open. A playwright has polished the script, investor have put up the money, and the theater has been rented. A director has been chosen, actors have been auditioned and selected, and the cast has been rehearsing for weeks. Set, lighting, and sound engineers have been hard at work. By the time opening night arrives, nearly a hundred people have labored tirelessly—all working long hours to make magic for their audience.

On opening night, four or five critics sit in the audience. If they pan it, the play will probably close in a matter of days or weeks. If they praise it, the production could go on for a long and successful run. In the end, success or failure might hinge on the opinion of a single person—someone who might be in a bad mood on opening night! What’s wrong with this scene In one sense, nothing. Critics have a legitimate role. The problem arises when we make critics our heroes or put them in control of our fate. When we empower the critic more than the playwright, something is wrong. It is much easier to criticize than to create. When we revere the critics of society, we eventually become a society of critics, and when that happens, there is no room left for constructive optimism.

It can be inferred from the text that if optimism were adopted, ().

A. no serious problems would arise in society

B. anything could be done with ease

C. some social problems could more possibly be solved

D. people would succeed in getting over all the obstacles

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