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文件管理模块 - App Inventor 2 中文网 - 清泛IT社区,为创新赋能!

appinventor2中数据存储的文件管理器模块,手机找不到根目录怎么办请提供详细的报错等截图!
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Modbus硬件控制02——modbus继电器 - 创客硬件开发 - 清泛IT社区,为创新赋能!

...产品上的按键进行重置为默认设置,即为9600波特率,8个数据位,偶校验,1个停止位。 二、模块功能 本模块具备一路数字输入和一路数字输出,还具备一个标准的 RS-485 通讯接口,通信使用MODBUS-RTU 协议。本模块支持所有常...
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AppInventor如何扫二维码?扫码结果如何与Web进行交互? - App Inventor 2 ...

...扫二维码。 Q:扫出来的码,怎么显示在我的Web页面的数据录入框中? A:这个要和 web 交互,要 web 里面暴露 js 接口供appinventor调用。       但如果页面是自己弄的,简单一点的方式就是往 web 的 url 后面追加参...
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什么是 Hex 编码方式?AppInventor 支持 Hex 编码传输吗? - App Inventor ...

Hex 编码方式通常指: 将二进制数据按十六进制文本形式表示。 也就是:binary data → hex string 使用 ByteArray 拓展可以转换 Hex 编码。 https://www.fun123.cn/reference/ ... l#ByteArray-Methods
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Import multiple csv files into pandas and concatenate into one DataFrame

...abases) as if it was one data source. There must be something similar in python, since it has had a 20 year jump start on doing "big data". – Hexatonic Dec 28 '15 at 4:22 303 ...
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ValueError: math domain error

I was just testing an example from Numerical Methods in Engineering with Python . 4 Answers ...
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How can you display the Maven dependency tree for the *plugins* in your project?

... The plugin doesn't respect overriding plugin dependencies in pom.xml (tag <build><plugins><plugin><dependencies><dependency>) – amra Sep 30 '15 at 11:54 ...
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Android -Starting Service at Boot Time

...ass); context.startService(myIntent); } } Your AndroidManifest.xml: <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.broadcast.receiver.example" android:versionCode="1" android:versionName...
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super() raises “TypeError: must be type, not classobj” for new-style class

... And this is one of the reasons we now have Python 3. – Steven Rumbalski Mar 15 '12 at 15:09 2 ...
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Circular gradient in android

... You can get a circular gradient using android:type="radial": <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> <gradient android:type="radial" android:gradientRadius="250dp" android:startColor="#E9E9E9" android:endColor="#D4D4D4...