【简答题】“梁父即楚将项燕”中“即”的词性是( )。 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
【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】“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.