2022年《坐井观天》第一课时教学设计修改版 .pdf

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1、1 1 坐井观天教学设计石溪劬劳小学梁杏燕一、教材分析坐井观天这则寓言，通过生动有趣的对话，给孩子们讲述了一个寓意深刻的故事。文章通过青蛙和小鸟对天的大小的争论，阐明了一个深刻的道理：看问题、认识事物，站得要高，看得要全面，不能像青蛙那样犯了错误还自以为是。这一寓意，对于低年级的小朋友来说具有现实的指导意义，因为他们对事物的认识往往是片面的。二、教学目标：1.能正确书写 8 个生字，理解“井沿大话无边无际”等词语。2.能用“（）无边无际，大得很哪!”说话。3.能正确、流利、有感情地朗读课文，分角色对话。4.能用自己的话复述课文，从中明白故事的道理。三、教学准备：课件四、教学课时：2 课时第一课

2、时一.复习导入1 集体背诵识字四。2 今天我们一起来学习 识字四里面的一个成语的故事，它是一则寓言故事 坐井观天。齐读课题。二、初读课文同学们都预习好课文了吗？1 出示生字：在预习中认为容易读错的字现在想提醒大家的？2 2（玉莹点评：可见教师有明确的预习要求，学生也已初步养成预习习惯。以学生互相提示难读字音检测预习情况，可行。但是学生的反馈面面俱到，比较耗时。建议教师在布置预习作业时，就要针对本课生字读音，结合本班学生拼读能力的弱点提出具体的要求。如该课的生字多是翘舌音的字，可要求学生预习时把翘舌音的生字圈出来，读准。上课检测时着重检查这类字。）2 出示生词。理解“井沿”。（1）课文中说小鸟落

3、下井沿上，打开书观察图一，再说说哪儿是井沿。（2）看来“井沿”就是井边，“沿”在这里的意思就是“边”。（教师手指桌沿）那么这是？-桌沿。学生给“沿”扩词。出示课件认识井底、井壁（城市的孩子可能没有见过井，可直接告诉学生井壁是密封的，青蛙在井底抬头看的时候，井壁会遮挡着视线。）（玉莹点评：结合图画，认识生字“沿”，认识井的特点，很好。“沿”字可让学生更充分组词。）3 把这些词语还原到课文的句子中去，你还能读通顺吗？我们自己读读课文。边读边想，坐井观天主要讲了什么内容？从书中你知道了什么？三、研读对话，随文识字1.反馈：坐井观天主要讲了什么内容？2.天有多大呢？小鸟和青蛙是怎么说的？再次默读课文，

4、从课文中找一找有关小鸟、青蛙说天到底有多大的句子。用直线画出青蛙的看法，波浪线画出小鸟的看法。（板书符号）3.反馈：出示课文 4.5 自然段，集体校正画句子的情况。齐读。4.研读第二次对话，争论的要点同学们，天到底有多大呢？文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I1

5、0 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I

6、10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4

7、I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J

8、4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9

9、J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F

10、9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4

11、F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B63 3（1）理解小鸟的观点：天，无边无际，大得很哪！出示课件，齐读句子：看，什么叫做“无边无际”？指名读。我们还可以说什么也无边无际？用“（）无边无际，大得很哪!”说话。（玉莹点评：学生词汇比较丰富，有“沙漠、海洋、草原、大地”，朗读指导到位。）（2）天如此无边无际，怪不得。出示课文第 3 自然段，集体读。（3）理解青蛙的观点。青蛙相信小鸟的话吗？所以他说小鸟在说大话。出示课件：“朋友别说大话了！天不过井口那么大，还用飞那么远？”理解“大话”：

12、“大话”是什么话？能换词说说句子。（玉莹点评：学生汇报有“朋友别吹牛了！朋友别撒谎了！朋友别骗人了！”此处处理较好的帮助学生搭建新知与已有经验的联系，有效地理解了“大话”。）青蛙问小鸟“天不过井口那么大，还用飞那么远？”它其实想说的意思是：（天不过井口那么大，不用飞那么远）。从句子的：“！、？”可见青蛙一点也不相信小鸟的话，谁能学着青蛙的样子，读出只信自己，不信别人的语气来？（玉莹点评：朗读指导细致，到位。就是齐读太多，让学生更多地自由表达就更好了。）5.感情朗读课文 15 段，加深对认识它们的观点。这节课我们学习了课文15 段，知道了青蛙和小鸟为了天到底有多大而争论，它们各有各的看法，我们分

13、角色朗读这5 段吧。文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR

14、10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 Z

15、R10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4

16、ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4

17、 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J

18、4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7

19、J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B64 4（玉莹点评：适当的回顾本课学习内容，回归整体，

20、有利于帮助学生把零碎的认知所得联系起来。）四、指导书写：沿际信蛙1.复习（1）生读字。（2）生组词并记忆字形。（如：二小左边长耳朵。）2.读帖写好这四个字，我们要注意什么？生自由说。（1）左右结构，左窄右宽。（2）“际 信 蛙”横画要注意长短，布局均匀。3.示范重点范写“际”：左耳旁是两笔写成（横撇弯钩竖），左右两点要对称。生书空。4.生练写。（握笔操端正写字姿势，师巡视纠正）（玉莹点评：学生握笔操熟练，既是调节课堂节奏，帮助学生适当放松的好办法，也是提醒学生端正写字姿势的好办法。从课堂观察可见，学生的坐姿较好，部分学生的握笔姿势正确。主要问题是学生捏笔，写字都太用力，要着重学习放松。方法可参

21、考花都屈太侠老师的文章，见空间转载。）5.评价。五、布置作业1.正确、流利地朗读课文（15 段）。2.书写 4 个生字。3.5 号本写句子：（）无边无际，大得很哪！文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编

22、码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档

23、编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文

24、档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6

25、文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B

26、6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10

27、B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W1

28、0B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B65 5 板书：小鸟井沿无边无际天有多大？青蛙井里不过井口那么大第二课时教学要点：1、朗读课文，复述故事，讨论道理。2、练习书写其他生字。教学过程：略。文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE

29、7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:C

30、E7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:

31、CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码

32、:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编

33、码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档

34、编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6文档编码:CE7H4F9J4I10 HB4P9T1G7J4 ZR10U4U2W10B6