Acceleration and velocity are both vectors.加速度和速度都是矢量。the velocity of light光速Einstein's theory links energy with mass and velocity of light.爱因斯坦的理论把能量同质量和光速联系起来....
It has the unique function of sterilization & kill acarid by ultraviolet and ozone radiation.具有紫外线 杀菌 功能,可高效驱除尘螨和细菌.Acarid of 134 species , individual number of which amounts to 4396, have been collected.按个体数多寡, 甲螨类>革螨类>...