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A．wouldn't existB．wouldn't have existedC．doesn't existD．has existed
A．wouldn't exist
B．wouldn't have existed
C．doesn't exist
D．has existed
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题目内容
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A．wouldn't exist
B．wouldn't have existed
C．doesn't exist
D．has existed
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已知f1(t)=tε(t)，f2(t)=ε(t)-ε(t-2)，求y(t)=f1(t)*f2(t-1)*δ'(t-2)。
