Passing by abrasive of whole hemisphere can be done the sealant,have concentrative wear and tear,sealed well.
Passing by abrasive of whole hemisphere can be done the sealant,have concentrative wear and tear,sealed well.
整个半球面都可以做密封面，集中磨损少，密封性好。
Passing by abrasive of whole hemisphere can be done the sealant,have concentrative wear and tear,sealed well.
整个半球面都可以做密封面，集中磨损少，密封性好。