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【单选题】
直流变换电路的工作 脉冲频率调制(PFM)工作方式:即ton 维持不变,改变TS,在这种调压,由于输出电压波形的周期是变化的,因此输出谐波的频率也是变化的,这使得( )的设计比较困难,输出谐波干扰严重,一般很少采用。A.
电感器
B.
滤波器
C.
变压器
D.
电容器
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反馈参考答案：
举一反三
【简答题】If p is a positive integer, and p≠0, is an integer? (1) p is an even number (2) p is a multiple of 3
【单选题】SWOT法又称为态势分析法，这四个字母分别代表优势Strength、劣势Weakness、（ ）
A.
机会Opportunity、威胁Threat
B.
乐观Objective、信任Trust
C.
机会Opportunity、信任Trust
D.
乐观Objective、威胁Threat
【简答题】When a population is said to be aging，_______.
【单选题】Slowing Aging: Way to Fight Diseases in 21st Century A group of aging experts from the United States and the United Kingdom suggest that the best strategy for preventing and fighting a multitude of di...
A.
is the best strategy for fighting diseases.
B.
focuses on slowing aging processes.
C.
has gone out of date.
D.
needs to be improved.
【简答题】For this part, you are allowed 30 minutes to write a com position on the topic The Aging Problem In China. You should write at least 120 words following the outline given below in Chinese: 1．人口老龄化问题正困...
【简答题】Even with an aging population, many Japanese are opposed to foreigners working in some industries.
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