单项选择题
If a good is labor intensive it means that the good is produced ____________.
A．using more labor per unit of output than goods that are not labor intensive.
B．using relatively more labor than goods that are not labor intensive.
C．using labor as the only input.
D．using labor such that the total cost of labor is greater than the total cost of capital.
,
为未知参数 ,
为来自总体
的一个样本,则
的矩法估计量、最大似然法估计量都是 
。( )