時間常數 : c = RC = 200kx10a = 2sec V ( 0 ) = 10V , V ( 0 ) = 0 , V ( 1 ) = 10e2y = 10-0.7V 0.5v 37. ( A )。時間常數: T = RC = 200kx10a = 2sec 30 6 38.
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