判断:已知f1(t)=ε(t+1)-ε(t-1),f2(t)= ε(t-1)-ε(t-2),则f1(t)*f2(t)的非零值区间为(0≤t≤3)。
判断:已知f1(t)=ε(t+1)-ε(t-1),f2(t)= ε(t-1)-ε(t-2),则f1(t)*f2(t)的非零值区间为(0≤t≤3)。
参考答案和解析
错误
相关考题:
()是检验股票市场是否弱势有效的最重要的一个等式。 A.E(Pj,t+1-Pj,t|It)=0B.E(Pj,t+1|Φt)=[1+E(rj,t+1|Φt)]Pj,tC.xj,t+1=Pj,t+1-E(Pj,t+1|Φt)D.E(Pj,t+1-Pj,t|Pj,t,Pj,t-1,⋯⋯)=0
若有如下程序: f2(char*t){*t=*t-32; return(*t);}fl(char*p){for(;*p!='\0';p++) if(*p>='a'*p<='z')f2(p); } main() {char a[10]="abcbgH"; f1(a); printf("%S",a); } 则程序运行后的输出结果是( )。A.ABCBGHB.abcdefghC.abcdgD.EFH
f1(t)←→F1(jω),f2(t)←→F2(jω)Then()。A、[af1(t)+bf2(t)]←→[aF1(jω)*bF2(jω)]B、[af1(t)+bf2(t)]←→[aF1(jω)-bF2(jω)]C、[af1(t)+bf2(t)]←→[aF1(jω)+bF2(jω)]D、[af1(t)+bf2(t)]←→[aF1(jω)/bF2(jω)]
Iff1(t)←→F1(jω),f2(t)←→F2(jω),Then()A、f1(t)*f2(t)←→F1(jω)F2(jω)B、f1(t)+f2(t)←→F1(jω)F2(jω)C、f1(t)f2(t)←→F1(jω)F2(jω)D、f1(t)/f2(t)←→F1(jω)/F2(jω)
单选题f1(t)←→F1(jω),f2(t)←→F2(jω)Then()。A[af1(t)+bf2(t)]←→[aF1(jω)*bF2(jω)]B[af1(t)+bf2(t)]←→[aF1(jω)-bF2(jω)]C[af1(t)+bf2(t)]←→[aF1(jω)+bF2(jω)]D[af1(t)+bf2(t)]←→[aF1(jω)/bF2(jω)]
单选题Iff1(t)←→F1(jω),f2(t)←→F2(jω),Then()Af1(t)*f2(t)←→F1(jω)F2(jω)Bf1(t)+f2(t)←→F1(jω)F2(jω)Cf1(t)f2(t)←→F1(jω)F2(jω)Df1(t)/f2(t)←→F1(jω)/F2(jω)
单选题设流场的表达式为:ux=-x+t,uy=y+t,uz=0。求t=2时,通过空间点(1,1,1)的迹线为( )。[2019年真题]Ax=t-1,y=4et-2-t+1,z=1Bx=t+1,y=4et-2-t-1,z=1Cx=t-1,y=4et-2-t-1,z=1Dx=t+1,y=4et-2+t+1,z=1
多选题下列数值等于期初普通年金终值系数的有()。A(P/A,r,t)(1+r)B(P/A,r,t-1)+1C(F/A,r,t)(1+r)D(F/A,r,t+1)-1E(F/A,r,t-1)+1