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MQTT物联网协议完全实践指南 · App Inventor 2 中文网
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MQTT协议深度解析
1. 协议架构与通信模式
2. 消息质量等级（QoS）详解
3. 主题设计与最佳实践
完整实战项目：智能温室控制系统
项目概述
系统架构设计
1. ...
How do you push a Git tag to a branch using a refspec?
I want to force push, for example, my tag 1.0.0 to my remote master branch.
4 Answers
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Make a Bash alias that takes a parameter?
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2193
Bash alias does not directly accept parameters. You will have to create a function.
alias doe...
How can I multiply and divide using only bit shifting and adding?
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14 Answers
14
Active
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FIND_IN_SET() vs IN()
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100
SELECT name
FROM orders,company
WHERE orderID = 1
AND companyID IN (attachedComp...
Uninstall old versions of Ruby gems
...# choose which ones you want to remove
gem uninstall rjb
# remove version 1.1.9 only
gem uninstall rjb --version 1.1.9
# remove all versions less than 1.3.4
gem uninstall rjb --version '<1.3.4'
share
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Length of generator output [duplicate]
...ou have a lazy infinite generator? For example:
def fib():
a, b = 0, 1
while True:
a, b = b, a + b
yield a
This never terminates but will generate the Fibonacci numbers. You can get as many Fibonacci numbers as you want by calling next().
If you really need to know the ...
How do I convert a TimeSpan to a formatted string? [duplicate]
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14 Answers
14
Active
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How to get the name of the calling method?
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213
puts caller[0]
or perhaps...
puts caller[0][/`.*'/][1..-2]
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