某患者全身骨显像图像上存在两个以上相邻的骨浓聚灶，其余无异常。造成这种情况的最可能原因是（）。

A.外伤

B.炎症

C.肿瘤骨转移

D.骨结核

E.甲状旁腺功能亢进

Two techniques for forecasting cash flows are to use projection models and averages, or statistical techniques. Which of these two methods would be most appropriate for: medium-term forecastinglong-term forecasting（）

A. Statistical techniques Statistical techniques

B. Statistical techniques Projection models and averages

C. Projection models and averages Statistical techniques