Two engineering teams, A and B, are working on a project. If A does it alone, it takes A (A is a positive integer) hours to complete; if B does it alone, it takes B (B is a positive integer) hours to complete. It is known that A<B, if two engineering teams work together. It will take 2012 hours to complete. Then how many pairs of natural numbers (A.B) satisfy the condition.
甲、乙两个工程队做一个项目．如果甲单独做需要A(A为正整数)小时完成；如果乙单独做需要B(B为正整数)小时完成．已知A＜B，如果两个工程队一起做．则需要2012个小时完成．则满足条件的自然数对(A．B)有多少对．
<result>2</result>