劳动供给决策的预算约束为：（）。
A.效用约束
B.时间约束
C.成本约束
D.收入约束
参考答案：C
I was given three books on sewing, the first ______ I really enjoyed.
A．that
B．which
C．of which
D．of that
什么叫个人合伙，由此产生哪些权利义务？
