A.ωz=0
B.ωz=-10xy
C.ωz=10xy
D.ωz=y
[单选题]某流速场的势函数ψ=5x2y2-y3,则其旋转角速度( )。A.ωz=0B.ωz=-10xyC.ωz=10xyD.ωz=y
[单选题]已知不可压流体平面流动的速度势函数φ=x2-y2+x,其流函数为( )。A.无流函数B.φ=y2-x2-xC.φ=2xy-yD.φ=2xy+yA.B.C.D.
[单选题]已知函数的全微分df(x,y)=(3x2+4xy-y2+1)dx+(2x2-2xy+3y2-1)dy,则f(x,y)等于( ).A.B.C.D.
[单选题]已知函数的全微分df(x,y)=(3x2+4xy-y2+1)dx+(2x2-2xy+3y2-1)dy,则f(x,y)等于( ).A.B.C.D.
[单选题]已知函数的全微分df(x,y)=(3x2+4xy-y2+1)dx+(2x2-2xy+3y2-1)dy,则f(x,y)等于( ).A.B.C.D.
[单选题]如x⊕y=x2+y2,则3⊕1⊕3=( )。A.109B.100C.120D.160
[单选题]如x⊕y=x2+y2,则3⊕1⊕3=( )。A.109B.100C.120D.160
[单选题]如x⊕y=x2+y2,则3⊕1⊕3=( )。A.109B.100C.120D.160
[单选题]如x⊕y=x2+y2,则3⊕1⊕3=( )。A.109B.100C.120D.160
[单选题]如x⊕y=x2+y2,则3⊕1⊕3=( )。A.109B.100C.120D.160