信号传输中可利用谐振特性构成各种滤波电路，将大部分干扰信号滤除。
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并联谐振时呈高阻特性，因此电路向电源取用的电流很小，支路电流也很小。
A. 对
B. 错
1.So _________ after she learned the good news that she could hardly fall asleep that night.
A.excited the mother was
B. was the mother excited
C. the mother was excited
D. excited was the mother
2.Not for a moment ________ the truth ofyour explanation about the event.
A. we have doubted
B. did we doubt
C. we had doubted
D.doubted we
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