题目内容

A．inB．atC．on

A. in
B. at
C. on

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A．thatB．whereC．which

A. that
B. where
C. which

A．ISDNB．OSIC．DDND．DSP

A. ISDN
B. OSI
C. DDN
DSP

A．atB．inC．after

A. at
B. in
C. after

A．specificB．disseminationC．protocolsD．communication

A. specific
B. dissemination
C. protocols
D. communication