Classification Electrical leakage protectors can be classified according to their protection functions, structural features, installation methods, operating modes, number of poles and lines, action...

Biographical life Michelson was born in Strzelno, a small town in Poland (Strzelno, then part of the Kingdom of Prussia), and his father was a Jewish businessman. When Michelson was only two years o...

Brief introduction "Modern Chinese Dictionary" is another important cultural project of Shanghai Lexicography Publishing House following the national project "Chinese Dictionary", which is listed in...

Introduction This is a medium-sized dictionary mainly for recording common discourses, for readers with a medium or above education level. There are more than 56,000 entries in the dictionary, includ...

Brief introduction The "New Modern Chinese Dictionary" has a unique style, diverse functions, and precise content. The style arrangement takes into account both scientificity and practicality. Each p...

Basic information Author: "New Modern Chinese Language Dictionary" Compilation Group Title: Publisher: World Book Publishing Company ISBN: Publication Date: 2008-08-01 Edition: 1 Pages: 780 Binding:...

Introduction The "Modern Chinese Dictionary" has been revised many times since its official publication in 1978 to adapt to the development of society, better reflect the new appearance of modern Chi...

Introduction to Cable TV CATV (Cable Television) for short Or fiber optic copper cable hybrid system. The earliest cable TV service appeared in 1948, when the cable TV network was used to realize th...

Basic introduction Currently, the production and broadcasting of TV signals have been digitized. Only the user’s signal reception is still in the analog stage, but users can use digital TV set-top b...

Basic overview IntroductionCable Modem access technology is developing rapidly in the world, especially in North America, with the number of users increasing at a rate of more than 100% each year. I...

Introduction China Cable has more than 40,000 kilometers of national radio and television optical cable backbone network, which connects more than 100 million cable TV users across the country, and i...

Definition Data block is a group of records arranged in sequence, between the main memory and the input, output device or external memory A unit of data for transmission. It is the physical record o...

Introduction Character of engine revolving speed refers to the functional relationship between the engine crankshaft speed and the power, torque and unit fuel consumption of the engine. This functio...

Calculation formula When the rotating magnetic field has opposite poles, the magnetic field will rotate in space every time the alternating current changes. So the synchronous speed iswhere: ——the f...

Introduction The faster the rotation speed of the hard disk, the faster the hard disk can find files, and the relative hard disk transmission speed has also been improved. The hard disk speed is expr...

Rotation speed concept Rotation speed is a physical quantity of the ratio of the number of revolutions of a rotating body to time. In engineering, it is usually expressed as speed = number of rotati...