When medical yttria stabilized zirconia beads are being produced, a thin metallic sheet is placed between the emitter and the target, effectively filtering out the lower energy (soft) X-rays.

• 健康网喝冷水好还是热水好，一般建议以三十度以下的温开水最好，比较符合胃肠道的生理机能，不会过于刺激胃肠道造成血管收缩或刺激蠕动。