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Self-study IT network Linux load balancing video tutorial

Course Intermediate 11251

Course Introduction："Self-study IT Network Linux Load Balancing Video Tutorial" mainly implements Linux load balancing by performing script operations on web, lvs and Linux under nagin.

Shangxuetang MySQL video tutorial

Course Advanced 17584

Course Introduction："Shangxuetang MySQL Video Tutorial" introduces you to the process from installing to using the MySQL database, and introduces the specific operations of each link in detail.

Band of Brothers front-end example display video tutorial

Course Advanced 11299

Course Introduction："Brothers Band Front-end Example Display Video Tutorial" introduces examples of HTML5 and CSS3 technologies to everyone, so that everyone can become more proficient in using HTML5 and CSS3.

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What is the best way to write array sorting and filtering functions with multiple parameters?

There is a game directory with a list of games that go through multiple filters. Games are divided by platform (HTC, PSVR, PS5, Favorites), and when you click on a tab, a computed property is triggered, for PS5 it is showPS5Games, which accepts the selected genre (genre), sort (selectedSort)), complex Checkbox "Suitable for children" (isChild), checkbox "Suitable for two" (isLocalMultiplayer) and search for games by name/tag/genre (query). All parameters

2024-01-16 23:10:56

Microsoft calls for deactivation of IE browser. How many browser cores are there now? Which browser do you prefer to use?

Drive China News on February 10, 2019 IE browser, as a web browser launched by Microsoft Corporation of the United States, has become the first choice for many people to access the Internet. It is loved by many users. However, this browser that has been smooth for many years has officially been abandoned! Today, Microsoft network security experts posted a post on the official Winhows IT Pro calling on users to stop using the IE browser! The current mainstream browser kernels include the following categories: Trident (IE kernel) IE kernel is mainly used in our IE browser in the WIndows system, and is developed and put into use by Microsoft. Gecko(F

2019-02-11 14:47:10

When calling the controller method, no input file specified. appears.

I am new to PHP and am using the index method of the phpstrom+phpstudy index controller. You can access the ----url is: www.demo.com The test1 method of the lindex controller. Access prompt: No input file specified.----url is: www.de

2020-05-16 17:37:57

javascript - Questions about the close() method of the http.Server class◔ ‸◔?

Code {code...} Description Why can't the close event be triggered even though server.close() is used? Take a look at the HTTP API description: Stop the server from receiving new connections. And TCP API description: Causes the server to stop accepting new connections and only keep existing connections. This function is asynchronous...

2017-05-16 13:42:34

How to wait for button click in Promise chain to pause execution?

I'm trying to chain some backend calls to process files, but the whole workflow requires the user to provide some input halfway through. I'm not sure how to pause execution until the user clicks a button "continue" so that it can continue working. So the process is as follows: the user selects a file and triggers an event to upload some data. I get the response from the previous call, opening a modal with a form. I need to pause here. Fill out the form and click the "Continue" button to continue the promise chain. Trigger another call to submit more information to another endpoint. So each of these steps involves a

2023-08-15 13:06:43

MoreQ&A

AC contactor usage and working principle

Course Introduction：AC contactor is a low-voltage control appliance widely used in power control systems. It is mainly used to control the operation of motors and equipment. Its structure consists of moving and static contacts, arc extinguishing device, electromagnetic coil, etc. When the coil is energized, the electromagnetic force attracts the moving contact and the static contact to connect, and the circuit is connected; after the power is turned off, the moving contact is released, the contacts separate, and the circuit is disconnected. AC contactors carry large currents, and their actions are usually controlled by relays. It has a wide range of applications, such as starting equipment, forward and reverse control, remote control, protection of motor overload and phase loss, etc., and is widely used in electric drive and automatic control systems.

2024-04-07 comment 0 1075

What is the use of AC contactor?

Course Introduction：AC contactors are mainly used to control large currents in AC circuits and have a wide range of uses, including: controlling the start and stop, reversal and speed regulation of motors, controlling on-off and temperature-adjusting heating equipment, controlling lighting switches and dimming controls, on-off, starting and Stop pumps and fans, control rolling shutters and hoists, act as switching elements in automatic control systems

2024-04-04 comment 0 760

How many times is the electrical life of an AC contactor the mechanical life?

Course Introduction：The electrical life of an AC contactor is generally 3-5 times the mechanical life. The electrical life is affected by contact wear, arc corrosion and contact welding; the mechanical life is affected by mechanism wear, spring fatigue and insulation aging.

2024-04-24 comment 0 935

Is the common maximum rated voltage of AC contactors 6000 volts correct?

Course Introduction：The common maximum rated voltage of AC contactors is usually 1000 volts, but for special applications such as high-voltage motor starting, power conversion and renewable energy systems, contactors with higher voltage ratings can be used, including: 1. High-voltage motor starting; 2. High voltage power conversion; 3. Renewable energy systems.

2024-04-24 comment 0 594

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