摄像机

The first involves choosing the type of sperm that is used to fertilise the woman's egg.

一种是选择特定的精子进入卵子。

One point method, mean square curve method and the maximum likelihood principle to predict P-S-N curve for welded steel structures for arbitary survival rate are presented.

本文建立了任意存活率下焊接钢结构P-S-N曲线预测的一点法，均方差曲线法极大似然法。