如果结果不匹配，请 
更多“A．SB．bC．（T)D．sd（T)”相关的问题
第4题
已知f1（t)=tε（t)，f2（t)=ε（t)一ε（t一2)，求y（t)=f1（t)*f2（t一1)*δ’（t一2)。
已知f1(t)=tε(t)，f2(t)=ε(t)一ε(t一2)，求y(t)=f1(t)*f2(t一1)*δ’(t一2)。
第6题
A．don't includeB．can't includeC．aren't includedD．haven't included
A.don't include
B.can't include
C.aren't included
D.haven't included
