tpo28 integrate writing

文章探讨了罗伯特·皮尔声称于1909年到达北极的争论。尽管国家地理学会调查委员会支持他的主张,但教授质疑调查的公正性和彻底性。最近的远征证实了皮尔可能的路线,但指出条件不同。照片证据也受到质疑,因为它们已退化且相机可靠性不足。

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Robert E. Peary was a well-known adventurer and arctic explorer who in 1909 set out to reach the North Pole. When he returned from the expedition, he claimed to have reached the pole on April 7, 1909. This report made him into an international celebrity. Though some historians have expressed doubts that Peary did in fact reach the North Pole, three arguments provide strong support for the truth of Peary's claim.

First, the National Geographic Society put together a committee that was instructed to conduct a thorough investigation of Peary's records and equipment. At the end of the investigation, the committee concluded that Peary's accounts were consistent and persuasive and declared that he had indeed reached the North Pole.

Second, a recent expedition provides support for Peary's claim that he reached the North Pole in only 37 days after setting out from Ellesmere Island off the coast of Greenland. Skeptics used to argue that Peary could not have traveled that fast, since even modern snowmobiles take longer to cover the same distance. However, a British explorer named Tom Avery recently made the same trek in less than 37 days. In fact, Avery used the same kind of dogsled and the same number and breed of dogs as Peary had. Thus, Peary's claims are not impossible, and he very well might have been telling the truth.

Third, there are photographs taken by Peary that support his claim to have reached the North Pole. Measuring the shadows in Peary's photographs makes it possible to calculate the Sun's position in the sky. The Sun's position established from the photographs corresponds exactly to the Sun's position as it should have been at the North Pole on that day. This provides strong evidence that Peary reached the North Pole and took the photographs there.

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The professor in the reading passage doesn't think the arguments are convincing.

Firstly, the committee do declare that Peary have been to the North Pole. However, one of committee member is Peary's friend who have sponsored for Pears expedition. Additionally, the investigation lasts only for two days which doesn't carefully exam whether Peary's claim is true. Actually, even Peary himself says that the examination isn't very rigid.

Secondly, even though Tom Avery made the same trek in less than 37 days, he actually carried far less weigh than Pears did. At the same time, Tom used modern airplane to drop the food he needed, while Pears didn't have such convenience that he had to carry the food along with him. Also, Tom didn't choose the same routes as Peary did. Additionally, Tom had that expedition when the weather is pretty favorable, on the contrary, Pears have such good weather conditions.

Thirdly, the photos that Pears would not provide solid evidences because the photos have already faded and wore away. So it is really hardly to calculate the sun's place with accuracy. Besides, the cameras he had used was also not very reliable than their modern counterparts. Furthermore, it is very easier to used computer software to change the sun place and create a photo like that.

一、综合实战—使用极轴追踪方式绘制信号灯 实战目标:利用对象捕捉追踪和极轴追踪功能创建信号灯图形 技术要点:结合两种追踪方式实现精确绘图,适用于工程制图中需要精确定位的场景 1. 切换至AutoCAD 操作步骤: 启动AutoCAD 2016软件 打开随书光盘中的素材文件 确认工作空间为"草图与注释"模式 2. 绘图设置 1)草图设置对话框 打开方式:通过"工具→绘图设置"菜单命令 功能定位:该对话框包含捕捉、追踪等核心绘图辅助功能设置 2)对象捕捉设置 关键配置: 启用对象捕捉(F3快捷键) 启用对象捕捉追踪(F11快捷键) 勾选端点、中心、圆心、象限点等常用捕捉模式 追踪原理:命令执行时悬停光标可显示追踪矢量,再次悬停可停止追踪 3)极轴追踪设置 参数设置: 启用极轴追踪功能 设置角度增量为45度 确认后退出对话框 3. 绘制信号灯 1)绘制圆形 执行命令:"绘图→圆→圆心、半径"命令 绘制过程: 使用对象捕捉追踪定位矩形中心作为圆心 输入半径值30并按Enter确认 通过象限点捕捉确保圆形位置准确 2)绘制直线 操作要点: 选择"绘图→直线"命令 捕捉矩形上边中点作为起点 捕捉圆的上象限点作为终点 按Enter结束当前直线命令 重复技巧: 按Enter可重复最近使用的直线命令 通过圆心捕捉和极轴追踪绘制放射状直线 最终形成完整的信号灯指示图案 3)完成绘制 验证要点: 检查所有直线是否准确连接圆心和象限点 确认极轴追踪的45度增量是否体现 保存绘图文件(快捷键Ctrl+S)
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