(A) 120 to 80 torr
(B) 100 to 80 torr
(C) 120 to 60 torr
(D) 60 to 140 torr
(A) 120 to 80 torr
(B) 100 to 80 torr
(C) 120 to 60 torr
(D) 60 to 140 torr
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