Q. What is the basic message of your book?

问：请问你这本新书的主旨是什么？

The basic principle and hypothesis are analyzed on the Z D and Q D combustion models of the diesel engine.

分析了柴油机零维、准维燃烧模型的基本原理和假设；

This paper describes the basic principle, measurement technique and experimental measurement system for determining the attenuation of a waveguide section by means of measurement of q.

本文论述通过q值测量来确定波导段衰减的基本原理、实验方法及系统装置。