问题如下图：
选项：
A. 
B. 
C. 
解释：
可以中文解释一下题目么？英文的解释不是特别懂 谢谢
NO.PZ2018062003000115 问题如下 The proction function is shown follows:Potentioutput growth = 1.25 + 0.68 × Growth of labor + 0.32 × Growth of capitalThe coefficient on the growth rate of capit(0.32) refers to: A.the marginproctivity of capital. B.the growth rate of totfactor proctivity. C.the relative shares of capitin nationincome. C is correct.In the neoclassicor Solow growth mol, the coefficient on eafactor’s growth rate is its share of income.考点α的定义解析本题直接考察α的定义，它代表资本对于总收入（总产出）中的贡献占比。 不是很了解nationincome是怎么构成的
NO.PZ2018062003000115 问题如下 The proction function is shown follows:Potentioutput growth = 1.25 + 0.68 × Growth of labor + 0.32 × Growth of capitalThe coefficient on the growth rate of capit(0.32) refers to: A.the marginproctivity of capital. B.the growth rate of totfactor proctivity. C.the relative shares of capitin nationincome. C is correct.In the neoclassicor Solow growth mol, the coefficient on eafactor’s growth rate is its share of income.考点α的定义解析本题直接考察α的定义，它代表资本对于总收入（总产出）中的贡献占比。 还在考纲范围吗，我看解答最少都是一年前的了
NO.PZ2018062003000115 the growth rate of totfactor proctivity. the relative shares of capitin nationincome. C is correct. In the neoclassicor Solow growth mol, the coefficient on eafactor’s growth rate is its share of income. 考点α的定义 解析本题直接考察α的定义，它代表资本对于总收入（总产出）中的贡献占比。请问C的中文意思是什么？不太懂
为什么不能理解成边际呢？增加一单位的资本，总产出也会相应增加 这么理解为什么不行呢？
