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At present, a probable inducement (诱因) for countries to initiate large scale space ventures is______.

A. international cooperation
B. nationalistic reasons
C. scientific research
D. long-term profits

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is a channel' s capacity which directly reflects the data transfer rate of the channel.(67)functions in a NetWare network which is used to define addressing schemes.(68)is a network layer device that suports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains.(69).is the popular LAN develped under the direction of the IEEE 802.3.(70)is a device which enables digital microcomputers to communicate across analog telephone lines.

A. The volume
B. The bandwidth
C. The noise
D. The delay

1989年国家土地管理局制定的()第2条第一次正式采用了土地他项权利的用语。

A. 《确定土地所有权和使用权的若干规定》
B. 《土地登记规则》
C. 《土地管理法》
D. 《城市房地产管理法》

会计法规定,国家统一的会计制度由()根据会计法制定并公布。

A. 国务院
B. 国务院财政部门
C. 全国人大
D. 国务院法制办

引起变态反应性疾病的环境因子主要是

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