下述条款给出了普通和高强度混凝土的原理和规定。
P The following clauses give principles and rules for normal and high strength concrete.
本文阐述了扩频技术的优点、各种扩频系统（直接扩频、跳频和混合系统）的原理和主要参数，以及国际上的规定。
This paper expounds the advantage of spread spectrum, principle and important parameters of the system, and the international regulation.
方法：按who规定的原理和方法进行：对流感流行株、抗原和基因变异以及血清抗体和病毒多病原实行监测。
Methods: According to the principle and methods of the WHO stipulation, the influenza epidemic strains, antigen, gene variation, serum antibody and virus multi-pathogen were monitored.
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