The unit of length refers to the basic unit for measuring the spatial distance, and is the basic unit formulated by humans to regulate the length. Its international unit is “meter” (symbol “m”), common units are millimeter (mm), centimeter (cm), decimeter (dm), kilometer (km), meter (m), micrometer (μm), nanometer (Nm) Wait. The unit of length plays an important role in various fields.[全文 Read More…]
The invention and use of mathematical symbols were later than numbers, but their numbers exceeded numbers. There are more than 200 mathematical symbols commonly used in modern mathematics, and each symbol has an interesting experience.[全文 Read More…]
A shape is composed of an object or its outer boundary, contour and surface, and has nothing to do with other characteristics of the object (such as color, texture, material composition, etc.). The shape can also be a closed space formed by a side or a curve or a combination of the above two things.[全文 Read More…]
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