...政策实验； 表函数 中图分类号： N 949; N 941.3; N 941.5 文献标志码： A Service [gap=829]Keywords ： system dynamics , simulation , pension reform , policy experiment , table function ..
And a big wireless carrier, AT&T,calls extending the net neutrality policy "a risky experiment" with American investment in high-speed Internet.
VOA: special.2009.09.25
Without a doubt, there is a grand experiment in economic policy taking shape across the country that could lead to a significant increase in the number of low to no-income tax states.