若9axb7与-7a3x-4b2y-1是同类项,则x=( ),y=( ).
2,4.
-Would you please show me Room 2501?
-Sure. ____ [ ]
A. Please go
B. No problem
C. This way,please
D. Go ahead
重症肺结核病人进行标准化疗的疗程为
A.3个月~5个月
B.6个月~11个月
C.12个月~18个月
D.19个月~24个月
E.25个月~36个月