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 or negative pressure stream正、负压流positive definite Hermitian operatorpositive-negative double selectionPNSpositive airway pressure ventilation正压通气positive and negative syndrome scale阳性与阴性症状量表positive implicative BCK - algebra正蕴涵BCK一代数positive rapid-plasma-reagin test快速血浆反应素环状卡片试验阳性Positive Control Communication System绝对控制通信系统positively charged gel drilling fluid正电胶钻井液positive displacement hydraulic motor容积式液压马达