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micro:bit 微控制器教程 · App Inventor 2 中文网
... 1. 机器人控制
2. 传感器数据监控
3. 双向通信
常见问题
Q: 扫描不到 micro:bit 设备？
Q: 连接失败？
Q: 无法接收温度数据？
Q: 控制指令无效？
...
由12306.cn谈谈网站性能技术 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...概有这些，a）被调用方的结果返回，会涉及进程线程间通信的问题。b）如果程序需要回滚，回滚会有点复杂。c）异步通常都会伴随多线程多进程，并发的控制也相对麻烦一些。d）很多异步系统都用消息机制，消息的丢失和乱...
Why does Hibernate require no argument constructor?
...ased mapping - maybe what you would like ? - because of some issues like
1º What happens whether your class contains a lot of constructors
public class Person {
private String name;
private Integer age;
public Person(String name, Integer age) { ... }
public Person(String name) {...
BLE协议—广播和扫描 - 创客硬件开发 - 清泛IT社区，为创新赋能！
广播和扫描在无线通信中是非常重要的一个技术点。在BLE中，扫描和广播是通信的基础，用户可以直接用扫描和广播进行数据的传输（数据量不大，功耗要求较高的情况下），也可以在广播和扫描的基础上进行连接后点对点通信...
Improving bulk insert performance in Entity framework [duplicate]
... answered Nov 6 '13 at 12:21
Måns TånnerydMåns Tånneryd
47344 silver badges88 bronze badges
...
How many files can I put in a directory?
...ld answer, I know… but when you write EXT4 – Maximum number of files: 2³² - 1 (4,294,967,295) and Maximum number of files per directory: unlimited you really confused me because 2³² - 1 != “unlimited”. I guess I need a coffee now. ;) Nevertheless +1
– e-sushi
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Difference between single and double square brackets in Bash
...d1 && cmd2
[ a = a -a b = b ]: equivalent, but deprecated by POSIX³
[ a = a ] && [ b = b ]: POSIX and reliable equivalent
(
[[ (a = a || a = b) && a = b ]]: false
[ ( a = a ) ]: syntax error, () is interpreted as a subshell
[ \( a = a -o a = b \) -a a = b ]: equivalent, ...
DateTime.ToString(“MM/dd/yyyy HH:mm:ss.fff”) resulted in something like “09/14/2013 07.20.31.371”
... answered Sep 2 '15 at 8:06
Håkon SeljåsenHåkon Seljåsen
46744 silver badges1212 bronze badges
...
In C# check that filename is *possibly* valid (not that it exists) [duplicate]
... edited Apr 30 '17 at 0:51
buræquete
12.5k44 gold badges3131 silver badges6262 bronze badges
answered Jan 7 '09 at 21:11
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Difference between InvariantCulture and Ordinal string comparison
...iosyncrasies out there.
Ordinal 0 9 A Ab a aB aa ab ss Ä Äb ß ä äb ぁ あ ァ ア 亜 Ａ
IgnoreCase 0 9 a A aa ab Ab aB ss ä Ä äb Äb ß ぁ あ ァ ア 亜 Ａ
--------------------------------------------------------------------
InvariantCulture 0 9 a A Ａ ä Ä aa ab aB ...