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问题 填空题

如图是已连接的一部分电路图，R1＝5 Ω，R2＝20 Ω。若R2两端电压为1.6伏时，ab 间、ac 间、bc 间的连接情况是                                                          .

答案

ab间不接ac间接2V 的电源bc间不接

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．broadcast

B．cable

C．control

D．interconnects

E．internet

F．meander

G．means

H．medium

I．modem

J．output switch relay
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单项选择题

劳务报酬所得的每次收入不超过( )的，减除费用800元，余额为应纳税所得额。

A．2000元

B．3000元

C．4000元

D．5000元
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