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[单选题]
A.pass toB.pass on toC.pass fromD.pass on
A.pass to
B.pass on to
C.pass from
D.pass on
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A.pass to
B.pass on to
C.pass from
D.pass on
Almost everyone failed______on the first day.
A.pass his driving test
B.to have passed his driving test
C.to pass his driving test
D.passing his driving test
已知f1(t)=tε(t),f2(t)=ε(t)-ε(t-2),求y(t)=f1(t)*f2(t-1)*δ'(t-2)。
已知信号h(t)=ε(t一1)一ε(t一2),f(t)=ε(t一2)一ε(t一4),则卷积h(t)*f(t)=_____________。