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【简答题】
An old man has spent all his life in a small village which is far from the city. One day, someone told him some interesting things about the city. He was so amazed at it that he decided to visit it. Everything was new and strange to him. The old man got excited and visited a lot of interesting places. Then he went into a large tall building and saw a lift. He didn’t know what it was used for. As he was watching it, an old woman got into the lift and the door closed behind her. After a few minutes, the door opened and a very beautiful young girl came out. The old man was very surprised. “What an interesting little room!” he said to himself, “Terrific, it can change an old woman into a young girl. I will be here with my wife next time.” Fill in each blank according to the passage. Only one word for each blank. From the passage, we know that the old man went to the city for the小题1: __________ time. He was very excited and surprised at what he saw. He didn’t know what the lift 小题2:__________. One day, he saw that an old woman 小题3:__________ the lift, then after a while a very beautiful girl came out, he decided to 小题4: __________ his wife here and 小题5: __________ her beautiful and young the next time.
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举一反三
【单选题】若二阶系统的调整时间短,则说明( )。
A.
系统的精度差
B.
系统的稳定性差
C.
系统响应慢
D.
系统响应快
【简答题】在检测三相异步电动机绕组间的绝缘电阻时,用单股导线将()端和()端分别接在电动机两绕组的接线端
【单选题】若二阶系统的调整时间短,则说明( )。
A.
系统响应慢
B.
系统响应快
C.
系统的稳定性差
D.
系统的精度差
【单选题】某RLC串联电路发生谐振,若只改变电路R的大小,其他参数不变,则以下说法正确的是
A.
改变R对选择性和通频带没有影响;
B.
若R变大,则电路的通频带变窄且选择性变好;
C.
若R变大,则电路的通频带变宽且选择性变好;
D.
若R变大,则电路的通频带变宽且选择性变差;
【单选题】某RLC串联电路发生谐振,若只改变电阻R的大小,其他参数不变,则以下说法正确的是:
A.
改变R对选择性和通频带没有影响
B.
若R变大,则电路的通频带变宽且选择性变差
C.
若R变大,则电路的通频带变宽且选择性变好
D.
若R变大,则电路的通频带变窄且选择性变好
【单选题】若二阶系统的调整时间 短 ,则说明 ( )
A.
系统响应快
B.
系统响应慢
C.
系统的 稳定性 差
D.
系统的精度差
【单选题】若 RLC 串联电路发生串联谐振,则以下说法错误的是( )。
A.
电路电流具有最大值
B.
阻抗 |Z|具有最大值
C.
电源发出无功功率为零
D.
电路的有功功率具有最大值
【简答题】斯坦福大学的科学家John McCarthy就指出“_______可能变成一种公共资源”。
【判断题】John McCarthy compares Cloud Computing with electricity in order to show their common point in the field of practical use.
A.
正确
B.
错误
【单选题】某RLC串联电路发生谐振,若只改变电阻R的大小,其他参数不变,则以下说法正确的是______.
A.
若 R 变大,则电路的通频带变宽且选择性变好
B.
若 R 变大,则电路的通频带变窄且选择性变好
C.
若 R 变大,则电路的通频带变宽且选择性变差
D.
改变 R 对选择性和通频带没有影响
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