There were connecting vessels between the villi arteriole and the villi venule at the tip of the villi, and they form a precapillary arteriovenous anastomosis.

Combining matrix method with finite element method, quantitatively analyzes the rigidity of bolts-flanges connecting system of pressure vessels.

The utility model relates to a slide block-connecting rod type door cover opening and closing device, which is suitable for being used in the fields of vessels, vehicles, hydraulic engineering, etc.