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问题 选择题

英法资产阶级革命的曲折性和反复性说明了________。

①资产阶级革命条件不成熟

②人民群众没有积极参加革命

③封建势力不甘心退出历史舞台

④新的社会制度代替旧的社会制度需要长期斗争[ ]

A、①②    

B、②③    

C、③④    

D、①④

答案

答案：C

单项选择题

Both bus and tree topologies are characterized by the use of multipoint（）．For the bus，all stations attach，through appropriate hardware（）known as a tap，directly to a linear transmission medium，or bus．Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the（）．A transmission from any station propagates the length of the medium in both directions and can be received by all other（）．At each end of the bus is a（），which absorbs any signal，removing it from the bus．

A transmission from any station propagates the length of the medium in both directions and can be received by all other（）．

A．routers

B．stations

C．servers

D．switches
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计算题

一个空心铜球的质量为89g，体积为30cm3．将它的空心部分注满某种液体后，总质量为361g．已知铜的密度ρ铜=8.9g/cm3，求：

（1）这个铜球空心部分的体积；

（2）注入液体的密度．
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