negative AGC反向自动增益控制negativeadj.否定的；消极的；负面的；负的n.否定；反面意见；底片；[数]负数vt.否定negative current protection负序过流保护negative environment effect环境负效应negative cross-adaptation负交叉适应negative acceleration phase负性加速期negative group veloci .ty负群速度Negative seismic reflection负反射negative skin test reaction阴性皮肤试验反应negative impedance inverter负阻抗变换器negative contrast technique负对照技术negative-positive process负正照相工艺,负-正法