例句 /

Abstract: This paper sets forth the historical periods of the development and application of primary explosive detonator, and discusses the development of some new types of detonators, points out its tendency and direction in the near future.

Abstract: This paper sets forth the historical periods of the development and application of primary explosive detonator, and discusses the development of some new types of detonators, points out its tendency and direction in the near future.

文摘:阐述了雷管各个阶段的发展概况,概述了目前几种新型雷管的研制、应用以及今后雷管发展的特点和趋势。