【单选题】一LTI连续系统,已知当激励信号为f(t)时,系统的零状态响应为y (t)= e -t ε(t),当激励信号为2 f (t) + f (t-1) 时,系统的零状态响应为
C.
2e -t ε(t)+e -(t-1) ε(t-1)
【单选题】I have hardly found myself bound when I ______ .
【单选题】When I reached the top of the mountain, I could HARDLY breathe.
【单选题】“悲风动中夜,边马嘶且惊。 壮士匣中刀,犹作风雨鸣。 飞将不见期,萧条阻北征。 关河空杳霭,烟草转纵横。”是( )
【单选题】Here are some tips _______what to wear ______ your first day at your internship.
【单选题】1884年,金玉均等( )为了驱逐保守势力,建立现代化国家,联合日本发动了政变,史称“甲申政变”。