问题如下图：
选项：
A. 
B. 
C. 
解释：
老师，A为什么不对？
还有，这个知识点是哪个，能不能帮忙定位下、
NO.PZ2016010802000112 问题如下 The sustainable growth rate is best estimateas: A.the weighteaverage of capitanlabor growth rates. B.growth in the labor forplus growth of labor proctivity. C.growth in totfactor proctivity plus growth in the capital-to-labor ratio. is correct.Output growth is equto the growth rate of the labor forplus the growth rate of labor proctivity, i.e. output per worker. Unlike totfactor proctivity, output per worker is observable, so this is the most practicwto approaestimation of sustainable growth.考点 Sustainable growth rate解析stainable growth rate 可以表示为 the growth rate of labor proctivity 与 the growth rate of the labor force的加和。 B也没漏掉了技术的增长率，题目出的是不是不严谨，c的错误在于是技术增长率和没劳动力的的资本增长率吗
NO.PZ2016010802000112问题如下The sustainable growth rate is best estimateas: A.the weighteaverage of capitanlabor growth rates. B.growth in the labor forplus growth of labor proctivity. C.growth in totfactor proctivity plus growth in the capital-to-labor ratio. is correct.Output growth is equto the growth rate of the labor forplus the growth rate of labor proctivity, i.e. output per worker. Unlike totfactor proctivity, output per worker is observable, so this is the most practicwto approaestimation of sustainable growth.考点 Sustainable growth rate解析stainable growth rate 可以表示为 the growth rate of labor proctivity 与 the growth rate of the labor force的加和。 a为什么不行，请老师解答一下，公式中是有权重的。谢谢
NO.PZ2016010802000112问题如下The sustainable growth rate is best estimateas: A.the weighteaverage of capitanlabor growth rates. B.growth in the labor forplus growth of labor proctivity. C.growth in totfactor proctivity plus growth in the capital-to-labor ratio. is correct.Output growth is equto the growth rate of the labor forplus the growth rate of labor proctivity, i.e. output per worker. Unlike totfactor proctivity, output per worker is observable, so this is the most practicwto approaestimation of sustainable growth.考点 Sustainable growth rate解析stainable growth rate 可以表示为 the growth rate of labor proctivity 与 the growth rate of the labor force的加和。 B是不是少了一个rate？
NO.PZ2016010802000112 growth in the labor forplus growth of labor proctivity. growth in totfactor proctivity plus growth in the capital-to-labor ratio. B is correct. Output growth is equto the growth rate of the labor forplus the growth rate of labor proctivity, i.e. output per worker. Unlike totfactor proctivity, output per worker is observable, so this is the most practicwto approaestimation of sustainable growth. 考点 Sustainable growth rate 解析stainable growth rate 可以表示为 the growth rate of labor proctivity 与 the growth rate of the labor force的加和。 看解析说stainable growth rate=劳动力+劳动效率
蓝色框的两个有啥区别？
