体细胞胚发育再生成植株有两个明显的特点： 一是体细胞胚具有 双极性 （ double polarity ）； 二是体细胞胚形成后与母体的维管束系统连系 较少，即出现所谓的生理隔离（physiological isolation）现象。
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double-polarity method for calibrating thermocouple 热电偶双级检定法
Double Polarity NRZ 双极性不归零码
double-polarity pulse-amplitude modulation [通信] 双极性脉冲调幅
double-polarity control 双极性控制
single polarity double frequency 单极倍频
uni-polarity double gauss pulse 单极性高斯脉冲
The way double polarity s function and LM algorithm combine with BP neural network is analyzed in the paper. The steps of new algorithm were given.
分析了双极性S型函数及LM算法与BP神经网络具体结合实现的方法，并给出了算法步骤。
In this paper, quantitative analyses on the effects of driving signal with different bias voltage polarity are made for double-sided driving with voltage feedback.
文章中定量分析了带有电压反馈的双边驱动信号对器件特性的影响。
It offers a 48 VDC redundant power input design and is secured with a double protection mechanism; power Polarity Reverse and an Overload Current Resettable Fuse.
它提供了一个48伏直流冗余电源输入设计，配备了双重保护机制：电源极性反转和过载电流自恢复保险丝。
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