What is the unit for measuring the length of the blackboard?

Measure the length of the blackboard, usually in meters.

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The blackboard is about 4 meters long.

Blackboard design with different specifications at different stages should comply with the regulations. Blackboard size: height should not be less than1000 mm. Width: primary school should not be less than 3600mm, middle school should not be less than 4000 mm. The vertical distance between the lower edge of the blackboard and the podium: 800 to 900mm for primary schools; Middle school should be 1000 to1100 mm.

An ordinary blackboard is about 3 meters long and 1 meter wide. In addition, the surface of the blackboard should be made of wear-resistant and dull materials. The horizontal distance between the two ends of the platform and the edge of the blackboard is not less than 200 mm, the width is not less than 650mm, and the height is 200mm.

Characteristics of various teaching blackboards:

1. The green board is dark green, written with chalk, which does not irritate people's eyes and is beneficial to protecting their eyesight; The surface of the whiteboard is white, and all kinds of water-based colored pens are used to write. The color-coated steel plate is made of high-quality alloy steel plate coated with wear-resistant coating, with a thickness of 0.3mm-0.4mm, which is wear-resistant, non-shedding, non-fading and durable.

2. Good writing feel, clear handwriting, easy to write, easy to wipe, and less dust. The new composite plate is made of imported polymer alloy particles and epoxy resin by one-time pressing, and the surface is not treated, and the thickness of the plate is 3 mm

3. The handwriting is clear and never slips. After testing, the service life is longer than 15 years. The flat board is flat and smooth, and the curved board is bent to prevent reflection, so that students sitting in every corner can see the handwriting on the blackboard clearly. Suitable for larger classrooms.

Extended data

Blackboard doesn't mean blackboard. Traditionally, it is a plane that can be written repeatedly with chalk. The board is relatively hard and is mostly used for teaching. Blackboards are usually made of wooden boards or frosted glass, and you can write on them with specific writing materials such as chalk. Most of them are black, dark green, white or beige.

In ancient China, an object called sand table was often used in teaching, and hardwood was used to write on the sand repeatedly. However, due to the softness of sand, it cannot be regarded as a blackboard. The green board is dark green, written with chalk, which does not irritate people's eyes and is beneficial to protecting their eyesight; The surface of the whiteboard is white, and all kinds of water-based colored pens are used to write.