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关注：1
2013-05-23 12:21
求翻译：在现代电力电子电路出现之前，要改变频率是一件非常困难的事是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
在现代电力电子电路出现之前，要改变频率是一件非常困难的事
问题补充： |
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2013-05-23 12:21:38
In before the advent of modern power electronic circuit, to change the frequency is a very difficult task
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2013-05-23 12:23:18
In the modern electric power electronic circuits, it is necessary to change before the advent frequencies is a very difficult task
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2013-05-23 12:24:58
Appears before the modern electric power electronic circuit, must change the frequency is an extremely difficult matter
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2013-05-23 12:26:38
Before the advent of modern power electronic circuits, to change the frequency is a very difficult task
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2013-05-23 12:28:18
Before the advent of modern power electronic circuits, to change the frequency is a very difficult task
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