positive set直接用上条柄拨针,固定位置,正集positiveadj.积极的；肯定的；明确的；正面的；正数的；阳性的n.正面；正数；正片；[语]原级positive consumption externalities正消费外部性positive definite symmetric kernel正定对称核positive displacement respirometer正排量呼吸计positive bag-type dust collector正压布袋除尘器positive contrast of reinforcement强化正对比positive definite second variation正定第二变分Positive Pressure Breathing System增压呼吸系统positive pressure pneumatic system位置拟等位基因positive and negative cases method正负个案法Positive operator-valued measure正定算符值测量