下列拓扑结构中,全属于广播式网络的拓扑结构的是()。
①星型
②网状型
③环型
④总线型
⑤卫星通信型
⑥树型
A、①②④⑥
B、①③⑤⑥
C、③④⑤⑥
D、②④⑤⑥
参考答案:C
The weather was warm, the food was inviting and the view was pretty — ____ we had a pleasant holiday.
A.exactly
B.meanwhile
C.finally
D.altogether
在RLC串联电路中,电容C可调,已知R=500Ω,L=60mH,要使电路对f=2820Hz的信号发生谐振,C值应调到()μF。
A.0.053
B.0.064
C.0.11
D.0.94