????????
13926899680
????
????
????
?PU??
?????
??????
EPDM
????
????
????
????
400???
???
????
???
????
???????
?????
?????
????:
??
>
????
>
????
????
???,????????
????
???
???
???
???
am8??
am8??
am8??
am8??
??k8??