positive arc正弧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 social control正面社会控制positive heteropycnosis正异固缩positive afterpotential正后电位positive image material正性光刻胶positive-sense strand正义链positive heteropyknosis正异固缩(染色体)[指固缩浓度较高, 染色较深]positive difference set正差集Positive vorticity zone正涡度区positive identification正确识别positive linear mapping正线性映射