短語詞組短語positive definite element 正定元positive valid element 積極生傚要件positive conditional element 非否定條件元positive e element 陽性元素positive concitional element 非否定條件元positive temperature coefficient element [制冷][電]正溫度系數(shù)元件Infinite positive element 無限正元strictly positive element 嚴格正元totally positive element 全正元 返回 positive element