在生产过程中，德兴铜矿的铜精矿经过旋流器分级后，矿浆中的-400

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问题单项选择题

在生产过程中，德兴铜矿的铜精矿经过旋流器分级后，矿浆中的-400目含量达到（）。

A、30%-40%

B、40%-50%

C、50%-60%

D、70%-80%

答案

参考答案：D

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．

For the bus，all stations attach，through appropriate hardware（）known as a tap，directly to a linear transmission medium，or bus．

A．processing

B．switching

C．routing

D．interfacing

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完形填空

找出有不同元音音素的字母或单词。（10分）