What is the full name of HB, CD and BBC? What do you mean?

1 and HB represent Brinell hardness, which indicates the ability of the material to resist hard objects pressing into its surface. It is one of the important performance indexes of metal materials. Generally, the higher the hardness, the better the wear resistance.

2. The physical dimension characteristics on the CD critical dimension (CD) chip are called feature dimensions. Another term to describe the feature size is the geometric size of the circuit.

The full name of BBC is BBC, which means BBC.

Extended data 1. Brinell hardness

A hardened steel ball with a certain size (generally diameter 10mm) is pressed into the surface of the material with a certain load (generally 3000kg) and kept for a period of time. After unloading, the ratio of load to indentation area is the Brinell hardness value (HB), and the unit is kilogram force per square millimeter (N/mm2).

Of particular concern is the minimum feature size on a silicon wafer, also known as critical dimension or CD. For example, if the smallest size on a chip is 0. 18μm, then this size is CD.

The British Broadcasting Corporation (BBC) was founded in 1922 and headquartered in London, England. It is the largest news broadcasting company in Britain and one of the largest news broadcasting companies in the world.

The BBC began to provide TV service on 1936, which is the first TV station in the world. From 65438 to 0967, the BBC broadcasted the Wimbledon Championship with color signals for the first time, thus opening the era of color TV. Today, BBC is not only a world-famous and well-known media, but also operates other businesses, including BBC Proms concerts, English teaching and symphony orchestras.

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Baidu encyclopedia -hb Baidu encyclopedia -cd? Baidu Encyclopedia-British Radio and Television