厂用电是指（）
A.发电厂辅助设备、附属车间用电
B.发电厂生产区、生活区内所用的电
C.发电厂辅助设备、附属车间及生产照用电
参考答案：C
We couldn't buy anything because ______ of the shops opened at that time. [ ]
A. all
B. some
C. any
D. none
制冷系数是如何定义的？
