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.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.D.1/
[单选题]已知xy=kz(k为正常数),则等于( )。A.1B.-1C.D.1/
[单选题]已知xy=kz(k为正常数),则等于( )。A.1B.-1C.D.1/
[单选题]已知xy=kz(k为正常数),则等于( )。A.1B.-1C.D.1/
[单选题]已知xy=kz(k为正常数),则等于( )。A.1B.-1C.D.1/
[单选题]已知xy=kz(k为正常数),则等于( )。A.1B.-1C.D.1/
[单选题]已知xy=kz(k为正常数),则等于( )。A.1B.-1C.D.1/