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App Inventor 2 EV3超声波传感器教程 · App Inventor 2 中文网
... 单次读取
实战案例：避障小车
EV3端准备
常见问题
Q1: 无法连接EV3？
Q2: 超声波读数为0或负数？
Q3: 读取速度慢？
总结
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概述
App Inventor 2提供LEGO MINDSTORMS EV3组件...
How to calculate the bounding box for a given lat/lng location?
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I suggest to approximate locally the Earth surface as a sphere with radius given by the WGS84 ellipsoid at the given latitude. I suspect that the exact computation of latMin and latMax would require elliptic functions and would not yield an appreciable ...
Do AJAX requests retain PHP Session info?
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What you're really getting at is: are cookies sent to with the AJAX request? Assuming the AJAX request is to the same domain (or within the domain constraints of the cookie), the answer is yes. So AJAX requests back to the same server do ...
Difference between require, include, require_once and include_once?
...n that you do not want to happen twice due to the HTTP overhead
But basically, it's up to you when to use which.
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Gradients in Internet Explorer 9
...soft.com/testdrive/Graphics/CSSGradientBackgroundMaker/Default.html
Note: all of these browsers also support rgb/rgba in place of hexadecimal notation.
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WakeLock 扩展：保持设备唤醒扩展，防止系统休眠和电池优化 · App Inventor 2 中文网
...Android 系统限制
唤醒锁类型
常见问题
Q: 为什么在 Companion 中无法使用？
Q: 如何处理电池优化？
Q: 使用唤醒锁会大量消耗电池吗？
Q: WiFi 锁有什么作用？
Q: 应...
What does “zend_mm_heap corrupted” mean
All of the sudden I've been having problems with my application that I've never had before. I decided to check the Apache's error log, and I found an error message saying "zend_mm_heap corrupted". What does this mean.
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PHP/MySQL insert row then get 'id'
...ithin its own isolated session, which is where the ID comes from when you call mysql_insert_id() from your PHP (or LAST_INSERT_ID() in MySQL)
– rodrigo-silveira
Sep 26 '12 at 18:22
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Google Sheets API Setup · App Inventor 2 中文网
...到一个指南，将询问有关我们正在制作的项目类型的各种问题。在”Which API are you using?”下的第一个下拉菜单中，选择Google Sheets API。
选择后，下面会出现一个后续问题。在”Where will you be calling the API from?”问题下，选择Other ...
How do I remove  from the beginning of a file?
...oks fine when I open it using gedit , but when it's read by PHP (to merge all the CSS files into one), this CSS has the following characters prepended to it: 
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