∵|a-5|+b+3=0,
∴a-5=0,b+3=0,
解得a=5,b=-3.
∴a-b=5+3=8.
故答案为:8.
______well prepared you are, you still need a lot of luck in mountain climbing.
A.However
B.Whatever
C.No matter
D.Although
什么是柱网?有什么作用?