7.设k>0,变量x,y满足约束条件$\left\{\begin{array}{l}{x-ky≥0}\\{x+2y-4≤0}\end{array}\right.$,若z=kx-y有最小值,则k的取值范围为( )
0 250894 250902 250908 250912 250918 250920 250924 250930 250932 250938 250944 250948 250950 250954 250960 250962 250968 250972 250974 250978 250980 250984 250986 250988 250989 250990 250992 250993 250994 250996 250998 251002 251004 251008 251010 251014 251020 251022 251028 251032 251034 251038 251044 251050 251052 251058 251062 251064 251070 251074 251080 251088 266669
A. | (0,1) | B. | (0,1] | C. | [1,+∞) | D. | (1,+∞) |