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CDN（内容分发网络）技术原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...内容的传送与同步更新。DNS方式用户位置判断准确率大于85%，HTTP方式准确率为99%以上；一般情况下，各Cache服务器群的用户访问流入数据量与Cache服务器到原始网站取内容的数据量之比在2：1到3：1之间，即分担50%到70%的到原始网...
Why are floating point numbers inaccurate?
...10 are 5 and 2, so in base 10 we can represent any fraction of the form a/(2b5c).
On the other hand the only prime factor of 2 is 2, so in base 2 we can only represent fractions of the form a/(2b)
Why do computers use this representation?
Because it's a simple format to work with and it is s...
SQL Server Installation - What is the Installation Media Folder?
... it from:
http://www.microsoft.com/downloads/en/details.aspx?FamilyId=C243A5AE-4BD1-4E3D-94B8-5A0F62BF7796&displaylang=en
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How do I format a number in Java?
...
customFormat("$###,###.###", 12345.67);
customFormat("\u00a5###,###.###", 12345.67);
Locale currentLocale = new Locale("en", "US");
DecimalFormatSymbols unusualSymbols = new DecimalFormatSymbols(currentLocale);
unusualSymbols.setDecimalSeparator('|');
...
Take screenshots in the iOS simulator
...s://medium.com/@hollanderbart/new-features-in-xcode-8-2-simulator-fc64a4014a5f#.bzuaf5gp0
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Replacement for “rename” in dplyr
...0x108b4e370
hp 0x108b4b210 0x108b4e4a0
drat 0x108b4b340 0x108b4e5d0
wt 0x108b4b470 0x108b4e700
qsec 0x108b4b5a0 0x108b4e830
vs 0x108b4b6d0 0x108b4e960
am 0x108b4b800 0x108b4ea90
gear 0x108b4b930 0x108b4ebc0
carb 0x108b4ba60 0x108b4ecf0
mpg 0x1033...
Adding a Method to an Existing Object Instance
...
#add more if needed
a = A()
print a
#out: <__main__.A object at 0x2b73ac88bfd0>
patch_me(a) #patch instance
a.method(5)
#out: x= 5
#out: called from <__main__.A object at 0x2b73ac88bfd0>
patch_me(A)
A.method(6) #can patch class too
#out: x= 6
#out: called from <class...
Reopen last closed tab in Visual Studio
...ds for Visual Studio 2010"
http://visualstudiogallery.msdn.microsoft.com/e5f41ad9-4edc-4912-bca3-91147db95b99/
Adds a command "Undo Close"
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How can I trim leading and trailing white space?
...snt as fast as some of the alternatives out there.
– A5C1D2H2I1M1N2O1R2T1
May 24 '15 at 8:05
doesn't seem to work for ...
How to upgrade R in ubuntu? [closed]
... answered May 7 '12 at 4:48
A5C1D2H2I1M1N2O1R2T1A5C1D2H2I1M1N2O1R2T1
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