某投资项目预计未来收益前景为“很好”、“一般”和“较差”的概率分别为30%、50%和20%，相应的投资收益率分别为30%、12%和6%，则该项投资的预期收益率为（）。

The OSI(66)model, sometimes also called ISO or 7 layers reference model for communication, has been developed by the International Standards Organization in early 1980's.

A．referent

B．reference

C．referance

D．refering

The OSI(66)model, sometimes also called ISO or 7 layers reference model for communication, has been developed by the International Standards Organization in early 1980's.

A．referent

B．reference

C．referance

D．refering

The OS!(68)model, sometimes also called ISO or 7 layers reference model for communication, has been developed by the International Standards Organization in early 1980' s.

A．referent

B．reference

C．referance

D．refering

The TCP/IP stack is a complete set of networking protocols. The OSI Model was meant

to be a standardized way of connecting devices together. and most protocols have some direct

correlation to the OSI Model. The OSI Model has 7 layers. the foruth layer is called(75)

A. physical layer

B. data link Iayer

C.application layer

D.transport layer

Manufacturer model is also called ()

A. a direct model

B. e-tailer

C. catalog merchant

D. Bit vendor

A．4

B．5

C．6

D．7

A．4

B． 5

C． 6

D． 7

A．4

B．5

C．6

D．7