设<img src='https://img2.soutiyun.com/latex/latex.action' />,则<img src='https://img2.soutiyun.com/ask/6678001-6681000/26b2c73d0b94b94ee3a6c186eaa3bd97.jpg' />( )

A.e<sup>-2t</sup>(t-1) B.e<sup>2(t-1)</sup>u(t-1) C.e<sup>-2(t-2)</sup>u(t-1) D.e<sup>-2t</sup>(t-2)

时间:2023-03-29 10:04:49

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