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【单选题】
电路如图所示,则电阻电流 i ( t ) 等于( )A。
A.
0.5(1-e -0.5 t ) ɛ( t )
B.
e -0.5 t ɛ( t )
C.
e -2 t ɛ( t )
D.
0.5(1-e -2 t ) ɛ( t )
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