活塞是内燃机上最重要的零件之一,工作条件极其恶劣。
The PS capsule whose main contents are proanthocyanidir and salvianolic acid could delay aging and have better endurance in adverse condition.提示原花青素和丹酚酸为主要成分的PS胶囊具有延缓动物衰老作用及增强耐受力的作用。
adverse condition of concrete in tension and steel joist in compression occurs at inner support regions of continuous composite steel concrete beams.连续组合梁在内支座处的负弯矩区段会出现混凝土板受拉、钢梁受压的不利局面。