The paper proves the theories concerning the number of trajectories along θ(U(θ)=0) approaching the singularity.
文章证明了沿方向θ(U(θ)=0)进入奇点的轨线条数的相关定理,且讨论了U(θ)≡0的情况,通过变换y=ux和x=uy,使得在新坐标平面中U-(θ)不恒为0。
Studies on the correlation of the rooting number and ratio of water cultivated Casuarina equisetifolia seed-lings showed: the correlation of the rooting number and ratio is significantly positive,the correlation coefficient: r=0.
研究木麻黄水培苗的出根条数和出根率的关系，结果表明：木麻黄水培苗的出根条数和出根率成极显著的正相关，相关系数 r=0。