The price to cash flow (P/CF) model has grown in popularity for all of the following reasons EXCEPT:（）

A. CFs are more easily estimated than future dividends.

B. CFs are generally more difficult to manipulate than earnings.

C. CFs may be used for firms that have negative earnings per share or do not pay dividends.

急性血源性骨髓炎的发病部位最常见于

A．尺桡骨

B．肱骨、肩胛骨

C．胫骨、股骨

D．髋骨、骶骨

E．脊椎骨