According to the analysis of the speed force of muscle contraction in track and field, the author point out the power training theory.
通过对田径运动中肌肉收缩速度力量分析，提出了提高运动员专项速度力量的训练原理。
2
The ligand field stabilization, the transition-metal contraction, and the lanthanide contraction are reflected in the relative values of the electronegativity scale.
此外，该标度值的相对大小还能反映配合物的稳定性，过渡金属收缩和镧系元素收缩等性质。
3
Started with the analysis of temperature field, the temperature-warping stress and temperature contraction stress of porous concrete are studied, and the location of joint are discussed.