功率调节螺钉螺纹
power adjustment screw thread
螺钉螺母调整机构
screw adjusting mechanism
内板锁紧螺钉螺纹
internal lock plate screw thread
4周死亡率
mortality rate in fourth weeks
5岁以下儿童死亡率
Child under 5 years old mortality rate
Child Mortality under age 5 years old
Under 5 Mortality Rate