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【单选题】
直流调速系统中直流电动机的励磁供电大多采用()加电容滤波电路。A.
专用高性能稳压电路
B.
三相桥式整流
C.
单相桥式整流
D.
三相可控整流电路
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反馈参考答案：
举一反三
【单选题】如在急性吸入毒性实验当中,随着苯的浓度越来越高,各试验组的小鼠死亡率也相应增高,这说明存在质反应关系
A.
量反应关系
B.
质反应关系
C.
剂量-量反应关系
D.
剂量-质反应关系
【单选题】Why does she feel that way?
A.
She has too much to do.
B.
She failed a test.
C.
She is getting married.
D.
Someone woke her up.
【单选题】How does the woman feel when she hears about the news?
A.
She is surprised.
B.
She is happy.
C.
She is sad.
【单选题】How does the woman feel about the test?
A.
She is not worried about it.
B.
Not mentioned.
C.
She is not sure about the test.
D.
She is sure it will be too hard.
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