Diff E[计] 横坐标差diff差速器diffusing capacity of oxygen氧弥散量Diffusible cyclone separator扩散式旋风分离器difficuh-to-cut material难加工材料Diffusive shock acceleration耗散加速Diffferent operation methods不同术式difficldties in finding jobs就业难diffusivity of chlonide ions氯离子扩散系数diffus neuroendocrine system弥散性神经内分泌系统diffictdt-to-cut material难加工材料Diffractive-refractive lens折衍射透镜