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在线服务的黑天鹅 - 资讯 - 清泛网 - 专注C/C++及内核技术

...服务可用性的不可控,可用性是指一个系统中提供服务与设计时间的比例,通常用百分比来表示。在线服务通常看到最多的是以下3种 99.9%,服务中断时间:525.6分钟/年 99.99%,服务中断时间:52.56分钟/年 99.999%,服务中断时间...
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“Diff” an image using ImageMagick

...age1 image2 -compose src diff.png compare image1 image2 -compose src diff.pdf The only difference between the 2 commands above: the first one shows the visual difference between the two images as a PNG file, the second one as a PDF. The resulting diff file displays all pixels which are different...
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How to get rid of blank pages in PDF exported from SSRS

I have a two-page SSRS report. When I exported it to PDF it was taking 4 pages due to its width, where the 2nd and 4th pages were displaying one of my fields from the table. I tried to set the layout size in report properties as width=18in and height =8.5in. ...
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Oracle中translate与replace的使用 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术

...ATE(& 39;,abcdefghij,& 39;,& 39;,jabcdefghi& 39;,& 39;+& 39;) FROM dual; --第二、三参数一一对应,没有对应就删除原 SELECT TRANSLATE(',abc,', ',cab', '+') FROM dual; --结果:++ SELECT TRANSLATE(',abc,', 'cab,', '+') FROM dual; --结果:+ TRANSLATE:第二、三参数一...
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iOS UI系列 (二) :使用多个StoryBoard - 更多技术 - 清泛网 - 专注C/C++及内核技术

... // Dispose of any resources that can be recreated. } } 设置第二ViewController的File’s owner 的class为刚新建的SecondViewController 第二个StoryBoard Command+N–>User Interface—>StoryBoard,命名Second 添加2个UIViewController, 并添加对应的按钮,...
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python plot normal distribution

...e) x = np.linspace(mu - 3*sigma, mu + 3*sigma, 100) plt.plot(x, stats.norm.pdf(x, mu, sigma)) plt.show() share | improve this answer | follow | ...
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刘强东:一家公司特别针对我们时 他已经恐惧了 - 资讯 - 清泛网 - 专注C/C+...

...心。 但是他们也知道,京东仍然超过一半的交易额来自电子和家电产品。刘强东透露,明年他的重点就是搞服饰鞋帽的自营。众所周知,这是阿里的核心品类。 这让我想起刘强东早年间的跟李国庆的一个战局。京东发力图书...
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App Inventor 2 中的响应式设计 · App Inventor 2 中文网

... App Inventor 2 中的响应式设计 « 返回首页 Responsive Design in App Inventor version 1.0: August 15, 2015 Responsive Design in App Inventor Specifying sizes as percentages Fixed vs....
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思维导图在快速阅读或是其它学习工作中的作用 - 创意 - 清泛网 - 专注C/C++...

...元。” ——MikeStanley,波音公司,美国 美国波音公司在设计波音747飞机的时候就使用了思维导图。据波音公司的人讲,如果使用普通的方法,设计波音747这样一个大型的项目要花费6年的时间。但是,通过使用思维导图,他们...
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How do I determine file encoding in OS X?

...lla OSX Yosemite, it yields more precise results than "file -I": $ file -I pdfs/udocument0.pdf pdfs/udocument0.pdf: application/pdf; charset=binary $ vic pdfs/udocument0.pdf latin1 $ $ file -I pdfs/t0.pdf pdfs/t0.pdf: application/pdf; charset=us-ascii $ vic pdfs/t0.pdf utf-8 ...