NO.PZ2015122801000033
问题如下：
Which of the following dimensions is used to classify firms as cyclical and non-cyclical firms?
选项：
A. Statistical method.
B. Business cycle sensitivity.
C. Products and services.
解释：
B is correct.
Firms can be classified by their sensitivity to business cycles. This system has two main classifications: cyclical and non-cyclical firms.
请问周期性和非周期性不是可以用产品和服务去判断么？比如汽车就是周期性的？