Select an appropriate type
Select the most appropriate type of water heater Based on the household water consumption, and consider its internal structure. According to the internal structure, the electric water heater is divided into three types: Water Box, open outlet and closed outlet. Among them, the water tank without liner, poor thermal insulation performance, the amount of water is also small; the o
This article introduces how to easily create a heater with a video card! If you need it, you can refer to the many things that have been broken recently. I haven't been here to write whimsical things for a long time. But this morning I thought of something interesting, so it took me half an hour to think about it. By the way, let's share it.
When the weather is cold, or when frozen hands are frozen ~ So this hot notebook is just a hot tool for drying
Requirement Analysis:Now there is a burner, assuming that the water temperature rises to 100 degrees for boiling water, please use the design program to simulate the whole process of boiling water, open the water heater, when the water temperature reaches 95 degrees, the alarm starts to send an alarm, when the water temperature reaches 100 degrees, disconnect the water heater power.
We use conventional th
There have been a lot of things recently, and I haven't been here to write whimsical things for a long time. But this morning I thought of something interesting, so it took me half an hour to think about it. By the way, let's share it.
When the weather is cold, or when frozen hands are frozen ~ So this hot notebook is just a hot tool for drying hands :)
What is lacking in the US is that when you don't want it to be hot at ordinary times, the fan is always flickering. I really want to make it hot
Recently, a lot of broken things, for a long time did not come here to write the whimsical thing. But this morning I thought of a very interesting thing, so it took half an hour to simply think about it, and by the way write a little share.
When the weather is cold, or frozen hands frozen feet ~ So this hot notebook just became a hand-baking tool:
The drawback is, usually do not want it hot, the fan is always daze. Now really want to let it hot, but not to power.
The solution is also very sim
PHP cannot obtain Referer for troubleshooting and referer for troubleshooting. PHP cannot obtain Referer troubleshooting. referer troubleshooting test results :? Phpecho Test Source: directly load the page br; echoahreftest_cookie.php enter the page abr; echo test source PHP cannot obtain Referer
Chapter 8 JVM performance monitoring and troubleshooting tools (2), jvm troubleshooting
Note: This blog is mainly recorded in "deep understanding of Java Virtual Machine (version 2)"
Note: For details about JVM performance monitoring and troubleshooting tools on the command line, see Chapter 7 JVM performance monitoring and t
Details of several common troubleshooting methods for routers, and details of several troubleshooting methods1. Serial Port troubleshooting
When a connectivity problem occurs in the serial port, in order to eliminate the serial port fault, the show interface serial command is generally used to analyze its screen output report content and locate the problem. The s
Atitit. troubleshooting series ----- troubleshooting when apache cannot be started
Atitit. troubleshooting series ----- troubleshooting when apache cannot be started
You can directly use cli to start httpd and print out detailed information ..
C: \ Users \ ASIMO> "C: \ wamp \ apache2 \ bin \ httpd.exe"
Httpd.exe: S
When winter is over, the leaves fall, And the geese fly south in a B-or T-shaped manner, the programmers are still playing the keyboard in the cold computer. As a good programmer, we can use a program to solve all the problems except our wives. What'
Linux system-network basic configuration and troubleshooting, and linux basic configuration troubleshooting
In linux, there are three types of network configuration: one is to directly implement the configuration file using command lines on the terminal, and the other is to modify the configuration file, another method is setup text interface settings.
The difference is that after the configuration file is
Although the Linux system is very powerful, stable, but we use the process, if the human operation is not appropriate, will still affect the system, and may even make the system does not boot, unable to run services and other problems. Then this blog post summarizes some common troubleshooting methods, but it is impossible to cover all, can only continue to supplement, update.first, the administrator forgot the password(1), restart the computer, enter
Java virtual machine performance monitoring and troubleshooting tools, virtual machine troubleshooting
1. jdk command line tool
1) jps: Virtual Machine Process status Tool
Jps [option] [hostid]
Main parameters:
2) jstat: Virtual Machine statistics monitoring tool
Jstat-
Main parameters:
For example, if the gc information of process 8675 is queried twice every 8675 ms, jstat-gc 1000 2
3) jinfo: Java conf
A case for troubleshooting slave database latency in MySQL: mysql troubleshooting
When a customer is inspected today, a core of the cpu of mysqld occupies 100% in the case of no business in the slave database. There is no SQL statement for querying the slow query of the master database.It can be said that the typical single-process replication causes a cpu to be fully occupied. If you know the reason, you c
Record the troubleshooting and resolution of a deadlock, and record the troubleshootingThis is a sad reminder. I remember last week's busy schedule. The goal is to modify some bugs in the code left by another team. This project is used for OLAP analysis, the Logic Server is mainly responsible for metadata operations, such as information displayed on the page, and the Analysis Server is responsible for executing query statements, because they used mond
One troubleshooting-when the disk clearly has space, but it cannot be written in, the disk will be troubleshooting
One week at work today, I finally started to operate and maintain the platform and encountered the first practical error.
Today, I encountered an alarm saying that the disk cannot be written and I checked the disk space.
When df-h is used to find that the disk is not fully written, there is
Oracle lock table troubleshooting example: Oracle lock table troubleshooting
One time a developer directly runs the delete table operating system on the database server during peak hours, resulting in no response for a long period of execution. Then, the SQLPLUS client is closed and the delete statement is run again, this causes the database to run slowly.The query operation knows that it is caused by the l
The local computer fails to start Apache troubleshooting, Apache fault handling
Recently, due to work needs, to learn the basic programming of PHP, so learning to set up PHP working environment.
However, as described in the textbook, after the installation of WMAP, has been unable to run successfully. It was found that Apache was not running. Go to the Apache option in WMAP to select Start but not start.
After the expert guidance, summed up the follo
GBK Chinese, but still in the compilation process is used garbled build② picture chromatic aberration (Srgb/argb/cmyk) and so on will cause compile error③ very grateful to the Teaching assistant's patient guidance, not only learned the knowledge also learned the open-source cooperative attitude, all day down the teaching assistants are all the way together to discuss, solve problems, not too many students annoying small problems, ta's enthusiasm and patience let me very touched. It's lucky to m
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