其他条件不变的情况下，企业财务风险大，投资者要求的预期报酬率就高，企业筹资的资本成本相应就大。

In the International Code of signals，a group of three letters indicates（）.

A.urgency or an emergency

B.the vessel's national identity signal

C.a group from the general signal code

D.a group from the medical signal code