提出了连续 反相 色层分离锆、铪新方法.A continuous reveree - phfise chrornatographic separation procedure for Zr and Hf was offered.这种细胞形成一稠密的色层足以覆盖其他颜色.These cells form a dense color layer which can cover all other colors.色层分析法: 又译色谱法. 利...
她用缝纫机缝制了这些裙子。She sewed the dresses on the sewing machine.我得花150美元买这台缝纫机.I have to pay 150 dollars for the sewing machine.这部旧缝纫机大概到了被淘汰的时候了.It's about time this old sewing machine was put out to pasture....