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 income effect积极所得效果positive spike pattern正峰型(脑电图)positive Cotton effect正考顿效应positive voltage relay正序电压继电器positive affer-image正后象positive salvage value清算价值positive feedback link正反馈链positive-geared feed压力进给positive definite form正定型positive recommendation积极的忠告