The OSI (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.(68)

A．referent

B．reference

C．referance

D．refering

[单选题]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．referentB．referenceC．referanceD．refering

[单选题]The OS！( ) model， sometimes also called ISO or 7 layers reference model for

[单选题] OSI is a theoretical model that shows how any two different systems can communicate with each other．Router, as a networking device, operate at the (71) layer of the OSI model．(71)A．transportB．applicationC．networkD．physical

[单选题]OSI is a theoretical model that shows how any two different systems can communicate with each other. Router, as a networking device, operate at the ______ layer of the OSI model.A．transportB．applicationC．networkD．physical

[单选题]A．t which layer of the OSI model does the protocol that provides the information displayed by the "show cdp neighbors" command operate?A．TransportB．PhysicalC．ApplicationD．Data linkE．Network

[单选题]We are ________sometimes of selfishness in our lives.A．miserableB．greedyC．guiltyD．sorry

[名词解释] 模型（Model）

[单选题]Nowadays people sometimes separate their waste to make it easier for it .A． reusing B. reused C. reuses D. to be reused

[单选题]Nowadays people sometimes separate their waste to make it easier for it ( ) .A． reusing B. reused C. reuses D. to be reused

[单选题]It is possible，and sometimes necessary，to strengthen the deck of a vessel for carriage of deck cargo by（）.A . placing bunker on the deckB . building a stage on which to place the cargoC . welding steel feet to the deck，on which the cargo is placedD .