The main advantage of powder metallurgy sintered gear is high precision, tolerance, low noise, good wear resistance, low cost, suitable for mass production.
粉末冶金烧结齿轮的主要优点是精度高，公差小、噪音低、耐磨性好、价格低廉，适合于大量生产。
2
The volunteers were divided into four groups according to their body mass index (BMI) and glucose tolerance.
根据体重指数和葡萄糖耐量将志愿者分为四组。
3
Superabundance of salinity in the soil imperils the growth of the mass of plants, especially does more harm to croppers which have lower tolerance to salinity.