单词	SPREF
释义	SPREF 🌏折射系数
随便看	negative differential drift velocity Negative differential expansion negative differential mobility negative differential resistance negative differential resistance characteristic negative differential resistance device negative differential resistance effect negative differential resistance region negative differential resistant negative dihedral negative dihedral angle negative dihedral wing negative diode clipper negative diopter negative direction negative-direction symbol negative discipline negative disclosure negative discount negative dislocation negative dislocation model negative dispersion negative displacemenet negative displacement negative displacement pump