短語(yǔ)詞組短語(yǔ)positive definite element 正定元positive valid element 積極生效要件positive conditional element 非否定條件元positive e element 陽(yáng)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(wú)限正元strictly positive element 嚴(yán)格正元totally positive element 全正元 返回 positive element