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【单选题】
有一个晶闸管 - 电动机调速系统,已知电动机参数为: P N =2.8kW , U N = 220V , I N =15.6A , n N =1500r/min ,电枢电阻 R a =1.5 Ω ,整流装置内阻 Rrec=1 Ω, 电枢回路电抗器电阻 R L =0.8 Ω ,触发整流环节的放大倍数 K s =35 。系统开环工作时,当 D=30 , s=10% 时,计算系统允许的稳态速降A.
10r/min
B.
5.56r/min
C.
15.7r/min
D.
26r/min
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A.
say
B.
speak
C.
tell
D.
talk
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A.
say
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speak
C.
tell
D.
talk
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A.
两头小中间大
B.
两头 大 中间 小
C.
我强敌弱
D.
势均力敌
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A.
say
B.
speak
C.
tell
D.
talk
【简答题】区域边界路由器
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【单选题】区域边界路由器?
A.
为所有区域维护一个数据库
B.
为所连接的每个区域维护一个独立的数据库
C.
维护两个数据库:骨干一个,其他所有区域一个
D.
为每个区域维护一个独立的路由表
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