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Outline. ?????????????????????????. ???????. ??. ??????:1atm~10-16torr?1920??:??? 1013~0.001mbar,???:???????????????????1960??:????? 1013~10-9 mbar,???:???:???????????????:???????:??????2000??:???????? 1013~10-13 mbar,???:???:???????????????:???????:??????????:????????. ??. ????????????,??

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