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问题 解答题

从称许到南京可乘列车A与列车B，已知徐州至南京里程约为350km，A与B车的平均速度之比为10∶7，A车的行驶时间比B车的少1h，那么两车的平均速度分别为多少？

答案

A车150km/h，B车125km/h.

单项选择题

文献综述的（）字一般不仅是讲述还要有评述性。

A.文

B.献

C.综

D.述
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单项选择题

A local-area network (LAN) is a communications network that (125) a variety of devices and provides a (126) for information exchange among those devices. The scope of the LAN is small typically a single building or a cluster (丛) of buildings. The LAN is usually owned by the same organization that owns the (127) devices. The internal data rate of LAN is at least several Mb/s.
The basic of LAN communication is broadcasting. At each station, there is a transmitter/receiver that communicates over a (128) shared, By other stations. A transmission from any one station is (129) to and received by all other stations.

A．adopted

B．attached

C．selected

D．unified
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