As a matter of fact, the factors affect the ratio through influencing the boy preference and the attainability of the B-ultrasonic.

事实上，这些因素通过影响男孩偏好和B超的可获得性而影响出生性别比。

This paper analyzed characteristic of different water treatment mode for generator internal cooling water, attainability technique target and economy and security.

本文分析了各种发电机内冷却水处理方式的特点、可达到的技术指标以及运行的经济性和安全性。