percussion rotary boring是什么意思

用法例句

The notions of a weak Hopf algebra and a smash product over weak Hopf algebra are Introduced.

介绍并研究了弱Hopf代数及其上的冲积概念和性质。

In this paper we study the concept of smash products over weak Hopf algebras and investigate their properties.

本文研究了弱Hopf代数上的冲积并讨论了它约性质。

We prove that the smash product A#H is of the same weak global homological dimension as A, provided that H~* is unimodular and there is a trace one element in A.

当H~*是幺模且A中存在迹为1的元素时,本文证明冲积A#H与代数A的弱整体维数相等。

Reservoir forming characteristics on the alluvial fan of Xinkai-Dongjiagang slope belt;

新开—董家岗斜坡带冲积扇体成藏特征

Discussion on issues related to the design of bridge site at the alluvial fans in the west and middle parts of Inner Mongolia Autonomous Region;

对内蒙古自治区中、西部山前冲积扇桥位设计几个问题的认识

Comparison between agricultural Land on alluvial fans at Qilian Mountain,Helan Mountain and Lüliang Mountain regions;

祁连山、贺兰山与吕梁山山前冲积扇上的农地对比