KGS could also improve the pathological changes in microstructure of bone, increase the thickness of trabecula and cortex (P <0.05) , reduce the trabecular gap and bone marrow cavity (P<0 . 05) .
At the same time with the screw pump, screw and screw with each other form a sealed cavity between one another to ensure airtight, otherwise there may be liquid from the gap in the back to go back.
同时螺杆与泵体、螺杆与螺杆间又相互形成密封腔，保证密闭，否则就可能有液体从间隙中倒流回去。
3
At the same time, it showed that the size of air gap around charge has important impact on the cylindrical cavity radius.