问题如下：
Chief Operation Officer of ABC company says, "At present our company is experiencing economies of scale. It is because we have specialize labor forces, and excess departments with different function lines." The COO is:
选项：
A. correct.
B. only correct on labor forces.
C. only correct on departments and function lines.
解释：
B is correct.
Excess departments and function lines is the reason of diseconomies of scale.
考点：Economies of Scale and Diseconomies of Scale
解析：专业化的分工可以降低生产成本，实现规模经济。但是多余的部门和生产线会造成资源的浪费会导致规模不经济。所以B选项正确。
老师，有过量的厂房的话，不是可以提高产量而不用增加固定成本，只需要增加可变成本，这样的话随着产量增加，平摊成本会下降
