不能把量符号当作纯数使用量的符号中虽然并不暗含某一特定的单位，但是，根据Ａ＝｛Ａ｝·［Ａ］，每个量符号中又确实存在着某个未指明的单位．例如：ｌ是长度的量符号，ｌ中必定包含着ｋｍ，ｍ，ｃｍ，ｍｍ等单位中的某个单位．因此，绝不能把表示量的符号当作纯数来使... A symbol that can not be used as a pure symbol does not imply a specific unit. However, according to A = {A} · [A], there is indeed an unspecified unit. For example: l is the length of the symbol, l must contain km, m, cm, mm and other units of a unit. Therefore, symbols that represent quantities must never be treated as pure numbers ...