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【判断题】
在MG1420万能磨床晶闸管直流调速系统控制回路电源部分，由V9经R20、V30稳压后取得+15V电压，以供给定信号电压和电流截止负反馈等电路使用。A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】细胞周期检验点
【简答题】I broke my relationship with him because he always found __________ with me. A． mistake B. failure C. error D. fault
【简答题】作者极力铺写王熙凤头饰、裙饰和服装的主要用意是什么?
【单选题】I broke my relationship with John because he always found _____ with me.
A.
error
B.
mistake
C.
fault
D.
failure
【单选题】I broke my relationship with him because he always found ______ with me.
A.
mistake
B.
failure
C.
error
D.
fault
【单选题】'What has happened?''The window ______ but I haven't found out who ______ it.'
A.
broke did
B.
is broken has broken
C.
is broken did
D.
has been broken has broken
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