two-level formula

Calculating formula and graphic method of geometric parameters between two crossover lines

交叉两直线间几何参数的计算公式及图解方法

Two errors in the theoretical flow rate formula are modified, and an extended energy equation is proposed.

纠正了理论流量公式中的两个错误，同时提出了推广的能量方程。

A formula of link relation of three-phase transformer is deduced using three absolute single-phase transformer based on mathematical model of single-phase two winding transformer.

以单相双绕组变压器数学模型为基础，用3个独立的单相变压器表征三相变压器的每一相，推导出了三相之间的连接关系方程；

China's tainted milk powder scandal escalated dramatically yesterday as 22 Chinese dairy companies were found to have produced infant formula containing a chemical blamed for killing two infants, state television reported.

中国的污染奶粉丑闻昨日戏剧性升级。官方电视台报道，有22家中国乳品企业生产的婴幼儿配方奶粉都发现含有一种被指造成两名婴儿死亡的化学品。

The theoretical specific impulse formula for two-phase flow in nozzle of rocket-ramjet engine is derived on the basis of similarity to that used for rocket engine.

本文导出了类似于火箭发动机的火箭冲压发动机喷管的两相流动理论比冲公式；