国内货物运输保险的保险金额通常按()确定。

A.货物成本价

B.货物发票价

C.货物发票价加运杂费

D.货物成本价加运杂费、保险费

In software engineering and systems engineering, (71) is a description of a system's behavior as it responds to a request that originates from outside of that system．

A．black box
B．business rule
C．use case
D．traceability matrix