大约有 46,000 项符合查询结果(耗时:0.0815秒) [XML]

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How to check if command line tools is installed

I have a macbook pro with OS X 10.8.2. XCode is installed. I know this as it appears in the Applications directory. There are also the xcodebuild and xcode-select files in /usr/bin I need to know if the command line tools is installed. Is there a command for it? What can I do to see if XCode CLT is ...
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What is the difference between t.belongs_to and t.references in rails?

What is the difference between t.references and t.belongs_to ? Why are we having those two different words? It seems to me they do the same thing? Tried some Google search, but find no explanation. ...
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Setting focus on an HTML input box on page load

I'm trying to set the default focus on an input box when the page loads (example: google). My page is very simple, yet I can't figure out how to do this. ...
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How do I detach objects in Entity Framework Code First?

There is no Detach(object entity) on the DbContext . 2 Answers 2 ...
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Xcode stops working after set “xcode-select -switch”

OMG, what I've done? 1 Answer 1 ...
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What exactly is Python's file.flush() doing?

I found this in the Python documentation for File Objects : 4 Answers 4 ...
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Missing Maven dependencies in Eclipse project

We have a project set up with maven for resolving dependancies. It usually works fine, but now I am trying to compile and run it on a new PC and I have problem with missing dependencies in Eclipse. ...
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Sorting a tab delimited file

I have a data with the following format: 10 Answers 10 ...
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How do negative margins in CSS work and why is (margin-top:-5 != margin-bottom:5)?

A common trick for vertical positioning elements is to use the following CSS: 7 Answers ...
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Foreign key constraints: When to use ON UPDATE and ON DELETE

I'm designing my database schema using MySQL Workbench, which is pretty cool because you can do diagrams and it converts them :P ...