A.1
B.-1
C.k
D.1k
[单选题]已知xy=kz(k为正常数),则等于( )。A.1B.-1C.kD.1/k
[单选题]已知xy=kz(k为正常数),则等于( )。A.1B.-1C.kD.1k
[单选题]已知xy=kz(k为正常数),则等于( )。A.1B.-1C.kD.1k
[单选题]已知xy=kz(k为正常数),则等于( )。A.1B.-1C.kD.1k
[单选题]已知xy=kz(k为正常数),则等于( )。A.1B.-1C.kD.1k
[单选题]已知xy=kz(k为正常数),则等于( )。A.1B.-1C.kD.1k
[单选题]已知为某函数的全微分,则a等于( )。A.-1B.0C.1D.2
[单选题]已知为某函数的全微分,则a等于( )。A.-1B.0C.1D.2
[单选题]A.14.0L/s,1.08mB.9.0L/s,1.08mC.9.0L/s,0.66mD.14.0L/s,0.66m
[单选题]A.16mg/LB.32mg/LC.64mg/LD.128mg/L