By using the finite element method, the dynamic stress caused by vertical contactimpact between bolt locking surface and barrel extension locking surface of a new rifle was studied.
采用有限元方法研究了某新型自动步枪枪机闭锁面与节套闭锁面间垂直接触碰撞的动应力。
2
The exact contact with practice has practical impact on me.
同实践的密切接触对我有实际的影响.
3
Their small size and low body weight soften the impact as they make contact with the ground after falling from great heights.