∵|x-2|+(y+1)2=0,
∴x=2,y=-1,
∴x-y=2+1=3;
故选D.
Someone ____ my umbrella! It is all wet. And it was wet yesterday and the day before yesterday. [ ]
A. has used
B. has been using
C. used
D. is using
6-Q-462型新蓄电池充电时间,第二阶段是()。
A、12~16h
B、40~50h
C、10~11h
D、45~55h