首页
登录
职称英语
[originaltext] It’s always fun to write about research that you can actually
[originaltext] It’s always fun to write about research that you can actually
游客
2024-05-12
5
管理
问题
It’s always fun to write about research that you can actually try out for yourself.
Try this:Take a photo and upload it to Facebook, then after a day or so, note what the URL link to the picture is, and then delete it Come back a month later and see if the link works. Chances are: It will.
Facebook isn’t alone here. Researchers at Cambridge University have found that nearly half of the social networking sites don’t immediately delete pictures when a user requests they be removed. In general, photo-centric websites like Flickr were found to be better at quickly removing deleted photos upon request.
Why do "deleted" photos stick around so long?The problem relates to the way data is stored on large websites: While your personal computer only keeps one copy of a file, large-scale services like Facebook rely on what are called content delivery networks to manage data and distribution. It’s a complex system wherein data is copied to multiple intermediate devices, usually to speed up access to files when millions of people are trying to access the service at the same time. But because changes aren’t reflected across the content delivery networks immediately, ghost copies of files tend to linger for days or weeks.
In the case of Facebook, the company says data may hang around until the URL in question is reused, which is usually "after a short period of time", though obviously that time can vary considerably.
30. Q:What does the speaker ask us to try out?
31. Q:What accounts for the failure of some websites to remove photos immediately?
32. Q:When will the unwanted data eventually disappear from Facebook according to the company?
选项
A、When the system is down.
B、When new links are set up.
C、When the URL is reused.
D、When the server is restarted.
答案
C
解析
就Facebook来说,公司表示等到URL链接被重新使用之后,照片才会被删除。
转载请注明原文地址:https://tihaiku.com/zcyy/3594941.html
相关试题推荐
[originaltext]Fullfacetransplantarenolongersciencefictionfantasy,
[originaltext]It’salwaysfuntowriteaboutresearchthatyoucanactually
[originaltext]It’salwaysfuntowriteaboutresearchthatyoucanactually
[originaltext]W:Thisfoodisterrible.Ican’tevenfinishmydinner.M:Ikno
[originaltext]M:Kate,hurryup!Wedon’thaveplentyoftime.Theplanewillt
[originaltext]M:Kate,hurryup!Wedon’thaveplentyoftime.Theplanewillt
[originaltext]M:Kate,hurryup!Wedon’thaveplentyoftime.Theplanewillt
[originaltext]M:Kate,hurryup!Wedon’thaveplentyoftime.Theplanewillt
[originaltext]M:Kate,hurryup!Wedon’thaveplentyoftime.Theplanewillt
[originaltext]M:Kate,hurryup!Wedon’thaveplentyoftime.Theplanewillt
随机试题
Everyyearthroughouttheworld【C1】______6,000earthquakesaredetected.The
________enoughtimeandmoney,theresearcherswouldhavebeenabletodiscover
以下关于我国现阶段电子政务建设的叙述中,不正确的是()。A.我国电子政务建设
波形梁钢护栏的冷弯黑色构件表面不得有裂纹、气泡、折叠和端面分层。()
关于意识障碍,下列叙述不正确的是A:不能正确认识自身状态 B:不能正确认识客观
生物技术药物包括()和寡核苷酸药物等。A.细胞因子 B.重组蛋白质药物
1.背景 某机场工程的混凝土成本数据如下表所示。目标成本为504000元,实际
依据糖尿病的诊断标准,确诊糖尿病选用( )。A.全血血糖 B.血浆血糖 C
知识点:库欣综合症女岁,脸圆,脸红,向心性肥胖1年余,患者明显的乏力,口干,
化脓性脑膜炎合并硬膜下积液,常见的病原菌是A.金黄色葡萄球菌 B.大肠杆菌
最新回复
(
0
)