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App Inventor 2 MQTT拓展入门(保姆级教程) · App Inventor 2 中文网
					...						教育													入门必读					中文教程					IoT专题					AI2拓展					ChatGPT接入					Aia Store					开通VIP																																																																搜索																																		
            
	        App Inventor 2 MQTT拓展入门(保姆级...				
				
				
							App Inventor 2 本地项目编译工具:本地高速编译,无冷却时间限制 · App I...
					...						教育													入门必读					中文教程					IoT专题					AI2拓展					ChatGPT接入					Aia Store					开通VIP																																																																搜索																																		            	        App Inventor 2 本地项目编译工具:本...				
				
				
							MIT已升级2.74版本,中文网已完成升级 - App Inventor 2 中文网 - 清泛IT社...
					MIT v2.74更新的内容如下:
新的 UI 选择器提示
向菜单、调色板和设计视图添加键盘导航
更新至 Google Blockly 版本 10
按住 Shift 并拖动以选择多个块
当值被拖近并且没有空闲插槽时,文本等块会自动合并并展开列表
将块拖到边...				
				
				
							app inventor 2 怎么进行延迟操作? - App Inventor 2 中文网 - 清泛IT社区,为创新赋能!
					app inventor 2 怎么进行延迟操作?https://www.fun123.cn/reference/creative/sim_sleep.html
App Inventor 2 模拟sleep函数 App Inventor 2 原生没有 sleep 及相关函数,需要模拟实现,经过测试这里给出一个既简单又相对高效率的实现方案:需要用到计时...				
				
				
							undefined reference to `WinMain@16'
					... objdump -x a.exe | findstr /i "^subsystem"
Subsystem               00000002        (Windows GUI)
C:\test> _
Hopefully that's OK so far, although the -mwindows flag is just semi-documented.
Building without that semi-documented flag one would have to more specifically tell the linker which su...				
				
				
							Why is it said that “HTTP is a stateless protocol”?
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        answered Nov 2 '12 at 17:24
    
    
        
    
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							clang error: unknown argument: '-mno-fused-madd' (python package installation failure)
					I get the following error when attempting to install  psycopg2  via pip on Mavericks 10.9:
                    
                    
                        
                            
                                
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							Strange out of memory issue while loading an image to a Bitmap object
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							Converting camel case to underscore case in ruby
					... underscore
    self.gsub(/::/, '/').
    gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2').
    gsub(/([a-z\d])([A-Z])/,'\1_\2').
    tr("-", "_").
    downcase
  end
end
Then you can do fun stuff: 
"CamelCase".underscore
=> "camel_case"
    
    
        
            
            
                
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							How to convert latitude or longitude to meters?
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Here is a javascript function:
function measure(lat1, lon1, lat2, lon2){  // generally used geo measurement function
    var R = 6378.137; // Radius of earth in KM
    var dLat = lat2 * Math.PI / 180 - lat1 * Math.PI / 180;
    var dLon = lon2 * Math.PI / 180 - lon1 * Math.PI / 180;
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