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Answers for “什么是坐标基?”

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A scalar records only magnitude, whereas a vector records both magnitude and direction. This distinction is necessary because describing a displacement requires knowing not just how far an object moved, but also in which direction it moved, unlike distance which is a scalar quantity.

Conditions: The context involves geometric examples.; Comparing scalar quantities (like distance) with vector quantities (like displacement).

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Component numbers are coefficients of reference vectors provided by a coordinate basis. Without specifying the basis, the numbers lack the reference directions needed to reconstruct the geometric vector.

Conditions: The context is coordinate systems and vector components.; The basis vectors define the reference directions for the components.