单词	豁免证明
释义	豁免证明 negative clearance
随便看	impulse time division system impulse time margin impulse timer impulse time relay impulse to mass ratio of nozzle Impulse to steal impulse totalizer impulse toxicant input impulse track circuit current impulse train impulse train generator impulse train modulation impulse train pause impulse-train pause impulse transfer impulse transferor Impulse Transfer Orbits impulse transformator impulse transformer impulse transmission impulse transmitter impulse transmitter tube Impulse-transmitting cable impulse transmitting relay impulse transmitting tube