∵若limn→∞an2+bnn+1=2,
∴a=0b=2,
∴a+b=2.
故答案为:2.
— that made him unhappy?
—Well, failing in his English test.
A.Where was it
B.What was it
C.How was it
D.Why was it
下列各项中属于制造企业产品成本的有()。
A.制造费用
B.燃料及动力
C.直接人工
D.直接材料