大的望远镜放大率同时放大了不稳定大气的影响.A large telescope magnification also magnifies the influence of unsteady air.结论: 不同区域的牙槽骨X线放大率不同.Conclusion: The X ray magnifying power is different depending alveolar areas.方法: 摄X线 检查时,通过测量参照物的X线放大...
泵的抽气速率与气体的性质有关.Lashing velocity of pump is concerned with nature of air.现在已经采用了低温吸附技术和吸气离子泵的近代电子抽气设备.Recent electronic means of pumping using low temperature sorption techniques and getter - ion pumps have been introduce...