单项选择题：任何机器或部件都由零件装配而成。表达单个零件的图样称为零件图，它是制造和检验零件的主

任何机器或部件都由零件装配而成。表达单个零件的图样称为零件图，它是制造和检验零件的主

发布时间：2018-02-28 02:13 │ 来源：www.tikuol.com

题型：单项选择题

问题：

任何机器或部件都由零件装配而成。表达单个零件的图样称为零件图，它是制造和检验零件的主要依据，是设计和生产过程中的主要技术资料；零件图一般包括下列内容；一组图形、必要尺寸、（）、标题栏等。

A.定位尺寸

B.材料要求

C.技术要求

题型：单项选择题

阅读《走一步，再走一步》选段，回答1—4题。

　　①我从石架向下望，感到头晕目眩；我绝对没法爬下去，我会滑倒摔死的。但是，往崖顶的路更难爬，因为它更陡，更险。我听见有人啜泣，正纳罕那是谁，结果发现原来是我自己。

　　②时间一分一秒地过去，暮色开始四合。在一片寂静中，我伏在岩石上，恐惧和疲乏使我全身麻木，不能动弹。

　　③暮色苍茫，天上出现了星星，悬崖下面的大地越来越暗。这时，树林里有一道手电光照来照去。我听到了杰利和我父亲的声音！父亲的手电光照着我。“下来吧，孩子，”他带着安慰的口气说，“晚饭做好了。”

　　④“我下不去！”我哭着说，“我会掉下去，我会摔死的！”

　　⑤ “听我说吧，”我父亲说，“不要想着距离有多远。你只要想着你是在走一小步。你能办得到的。眼睛看着我电筒的光照着的地方，你能看见石架下面那块岩石吗？”

　　⑥我慢慢地把身体移过去。“看见了。”我说。

　　⑦“好，”他对我说，“现在你把左脚踏到那块岩石上。不要担心下一步。听我的话。”

　　⑧这似乎能办得到。我小心翼翼地伸出左脚去探那块岩石，而且踩到了它。我顿时有了信心。“很好，”我父亲叫道，“现在移动右脚，把它移到右边稍低一点的地方，那里有另外一个落脚点。”我又照着做了。我的信心大增。“我能办得到的。”我想。

　　⑨我每次只移动一小步，慢慢爬下悬崖。最后，我一脚踩在崖下的岩石上，投入了父亲强壮的手臂中。我先是啜泣了一会儿，然后，我产生了一种巨大的成就感。这是我永远忘不了的经历。

　　⑩我曾屡次发现，每当我感到前途茫茫而灰心丧气时，只要记起很久以前我在那座小悬崖上所学到的经验，我便能应付一切。我提醒自己，不要想着远在下面的岩石，而要着眼于那最初的一小步，走了这一步再走下一步，直到抵达我所要到的地方。这时，我便可以惊奇而自豪地回头看看，自己所走过的路程是多么漫长。

1．我在父亲的指引下，一步步爬下了悬崖。请写出我爬下悬崖时的心理感受： ______________、我的信心大增、_______________。

2．第③段画线处运用了什么描写？有什么作用？

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3．第⑩段中你认为哪一句能揭示文章主旨，请写出来。

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4．面对生活中的困难你将怎么办？请结合文章主旨谈谈你的感悟。

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完形填空。
Alice was a young woman who liked to exercise for her health . In fact , she walked five kilometers before__1__ every morning , and went swimming once a week at the swimming pool . She didn’t smoke and never 2 . She didn’t eat chocolate . She didn’t eat sweet and fatty food , __3__ . She weighed herself every day . Once Alice was on her daily walk when she saw a 4 sitting in a rocking chair under a tree . He looked very old and his hair was white . he looked thin and weak , and his hands were shaking , 5 he looked very happy . He smiled at her and said , "Good morning , lovely day , isn’t it ?" He had a wide smile 6 his face , and his eyes shone with happiness . But Alice saw that he did not have teeth . "Good morning!" replied Alice . "Yes , it is a lovely day ." Alice thought he 7 very old and wise . She thought he must be at least 90 years old ! She decided to ask him about the 8 of a happy old age . "I hope you don’t 9 me asking ," she said , “ but what is your secret for being so happy at your age ? I hope I can look as happy as you do 10 I am your age ” The man in the rocking chair said , "My secret for 11 ? I smoke twenty packets of cigarettes every week , and drink three bottles of wine every day . I eat hamburgers and chocolates whenever I want . I never eat vegetables . I never walk anywhere and I never play sports . I sit at home every day . " Alice was 12 . She didn’t expect the man to give her an answer like that . She wondered how the man got to be so old when he did 13 wrong.She thought he should be 14 and unhappy.Perhaps she was wrong . Maybe , she thought , people could live a long happy life 15 eating well or doing lots of exercise . "How old are you ?"she asked . "It’s my birthday today ,” said the man , "I’m forty-seven !"
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