限制生产能力的成本应由以下哪项来计量

A．损失的贡献毛利。
B．产量差异。
C．除数差异。
D．固定间接费用单位成本。

What kind of scene might be shown in a typical regionalist painting().

A.People working in a large factory.

B.People walking on crowded city streets.

C.An everyday activity in a small town.

D.A well-known historical event.