“symmetrical alternating quantity”的概念、定义、翻译、参考文献-科学参考

单词	symmetrical alternating quantity
释义	symmetrical alternating quantity [sǝ`me·trǝ·kǝl `ȯl·tǝr´nād·iŋ `kwän·ǝd·ē] ^PHYSICS Alternating quantity of which all values separated by a half period have the same magnitude but opposite sign.
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