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 electrode materials负极材料Negative chemical ionization负化学离子源negative A-ignore-B gate与B无关的A非门negative conditional element否定条件元negative impedance converter负阻抗变换器Negative refraction material负折射率材料negative frequency deviation负频偏negative-displacement pump负排量泵, 负排代泵negative chronotropic action负性频率作用negative-ion mass spectrum负离子质谱