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Utilization factors help estimate diggability of excavators: Chironis, N P CoalV95, N10, Oct 1990, P58–59doi:10.1016/0148-9062(91)93034-4NoneELSEVIERInternational Journal of Rock Mechanics & Mining Sciences & Geomechanics Abstracts
设有限长序列为x(n) , N1 ≤ n ≤ N2,当N10 , Z变换的收敛域为( ) A. OVlZlV ∞ B. ∣z∣>0 C. ∣Z∣ D. ∣z∣≤∞