The likelihood ratio criterion of sphericity test, its asymptotic expansion and limiting distribution are obtained.
论文得到了球形检验的似然比准则，它的渐近展开与极限分布。
2
With the drop of concentration, the sphericity goes bad, particle size decreases and particle distribution becomes narrow.
结果表明：随母液固含量的降低，样品的粒径变小，粒径分布也更为均匀，但其球形度变差；
3
The results show that the free-lead solder powder is best in the efficient atomization efficiency, size distribution and degree of sphericity with helium as the atomizing medium.