1. Seating load and tightness is dependent on back pressure. 阀座密封负载和紧密性与反压力相关。
2. Presents the management methods of air tightness and vacuum degree. 介绍了机组气密性管理和真空度管理的方法。
3. Yes. I have had chest tightness. But I really felt uncomfortable yesterday. 有,我以前就有感到胸闷过,但我昨天真的感觉很糟。
英英解释
n.
1. a state occasioned by scarcity of money and a shortage of credit
2. a tight feeling in some part of the body
3. the spatial property of being crowded together
4. extreme stinginess
5. lack of movement or room for movement