? ??????????×‥????? ????? ? ?§????
??? °?????? ??????? °?????? ??? ??? ? ????
??? °?????? ??????? °?????? ??? ??? ? ????
??? ? ??
????????
????±‥??
? ??????????????????--×‥????? ????? ? ?§??
? ??????????????????????? ????????????????×??°?????÷? ?±????????????????????????????? ????(PTFE)??? ??? ????????????×‥???§??????????? ? ?÷??????????????????PTFE????°???°??????÷°??°±?? ??????? ??????????,????? ????°?,??????????? ??????,??????????? ????? ????????? ×????????§??? ????±?????×‥??? ? ? ??????????? ?????????÷??? ??????????? ?????‥F4?????????????? ...
? ?????????????????? ???? ?÷????? ?????‥??? ????
? ??????????????????Journalism
????? ????????????????????? ?????‥±????????????????????±? ?????????????‥??????? ??±??????????????????±? ????? ±???? ???? ...
??? ????Tetrafluorodynamic
??? ???°×???
