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。
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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
10. It was simply for some special reason __________ I didn't tell you the truth at that time.
A. why
B. that
C. which
D. so
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