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三相异步电动机的Y-△降压启动控制 一、目的 1．对鼠笼式三相异步电动机Y-△降压启动控制线路的接线，把电气原理图接成实际操作电路。 2．分析三相异步电动机的Y-△降压启动控制的原理和方法。 3．熟悉三相异步电动机的Y-△降压启动控制线路的接线方法。 二、原理 三、设备 (1)万用表一只。 (2)兆欧表一只。 (3)钳形电流表一只。 (4)电工工具一套。 (5)室电源及其他设备。 (6)导线若干。 (7)控制电路元件(如表所示)。 所需电路原件 Q 电源开关 1 FU 1 、FU 2 熔断器 5 SB 2 、SB 1 启动、停止按钮 2 KM 1 、KM 2 、KM 3 交流接触器 3 KT 时间继电器 1 FR 热继电器 1 M 电动机 1 导线 若干
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参考答案：
举一反三
【单选题】听力原文：W: You had met Professor Black before,right?How would you describe his lectures? M: Well,let me put it this way: I could never stay awake in one of his classes without first drinking at least two...
A.
He is fond of drinking coffee.
B.
Professor Black's lectures were interesting.
C.
He skipped Professor Black's classes.
D.
Professor Black's lectures were boring.
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【简答题】名词解释:移动定位技术
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【单选题】听力原文：W: I understand you took one of Professor George's classes, didn't you? Is that interesting? M: Let me put it this way. I can safely say that I never needed a cup of coffee to keep me awake in hi...
A.
Professor George's class is very interesting.
B.
Professor Jordan's class is more interesting.
C.
He hasn't attended Professor Jordan's class.
D.
He hasn't attended Professor George's class.
查看完整题目与答案
【判断题】电视社会生活节目和主持人之间的黏合度非常高
A.
正确
B.
错误
查看完整题目与答案
【简答题】American middle school students don’t seem to care that they’re worse at maths than their counterparts (同龄人) in China’s Hong Kong and Finland. “I don’t need it,” my student says, “I’m going to be a ba...
查看完整题目与答案
【单选题】Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the ...
A.
She attended Prof. Smith's class for three times.
B.
She finds Prof. Smith's class fascinating.
C.
She doesn't like the professor's class.
D.
Prof. Smith always looks at his watch during the class.
查看完整题目与答案
【单选题】听力原文：W：I understand you dropped Professor Jordan's classes and took one of Professor George's classes，didn't you? Is he that interesting? M：Let me put it this way. I can safely say I will never need a...
A.
Professor George's class is too boring.
B.
Professor Jordan's class is more interesting.
C.
Professor George's class is very interesting.
D.
Professor George never allows students to drink coffee in class.
查看完整题目与答案
【判断题】畜禽经检验 确诊 患有 炭疽病,应当急宰。
A.
正确
B.
错误
查看完整题目与答案
【单选题】NTFS文件系统在 MBR 的分区模式下所能管理的最大分区容量为()
A.
4TB
B.
128TB
C.
1TB
D.
2TB
查看完整题目与答案
【单选题】隙感染中何种最容易导致呼吸困难
A.
眶下间隙
B.
翼颌间隙
C.
咬肌间隙
D.
下颌下间隙
E.
口底蜂窝织炎
查看完整题目与答案
相关题目：
【单选题】听力原文：W: You had met Professor Black before,right?How would you describe his lectures? M: Well,let me put it this way: I could never stay awake in one of his classes without first drinking at least two...
A.
He is fond of drinking coffee.
B.
Professor Black's lectures were interesting.
C.
He skipped Professor Black's classes.
D.
Professor Black's lectures were boring.
查看完整题目与答案
【简答题】名词解释:移动定位技术
查看完整题目与答案
【单选题】听力原文：W: I understand you took one of Professor George's classes, didn't you? Is that interesting? M: Let me put it this way. I can safely say that I never needed a cup of coffee to keep me awake in hi...
A.
Professor George's class is very interesting.
B.
Professor Jordan's class is more interesting.
C.
He hasn't attended Professor Jordan's class.
D.
He hasn't attended Professor George's class.
查看完整题目与答案
【判断题】电视社会生活节目和主持人之间的黏合度非常高
A.
正确
B.
错误
查看完整题目与答案
【简答题】American middle school students don’t seem to care that they’re worse at maths than their counterparts (同龄人) in China’s Hong Kong and Finland. “I don’t need it,” my student says, “I’m going to be a ba...
查看完整题目与答案
【单选题】Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the ...
A.
She attended Prof. Smith's class for three times.
B.
She finds Prof. Smith's class fascinating.
C.
She doesn't like the professor's class.
D.
Prof. Smith always looks at his watch during the class.
查看完整题目与答案
【单选题】听力原文：W：I understand you dropped Professor Jordan's classes and took one of Professor George's classes，didn't you? Is he that interesting? M：Let me put it this way. I can safely say I will never need a...
A.
Professor George's class is too boring.
B.
Professor Jordan's class is more interesting.
C.
Professor George's class is very interesting.
D.
Professor George never allows students to drink coffee in class.
查看完整题目与答案
【判断题】畜禽经检验 确诊 患有 炭疽病,应当急宰。
A.
正确
B.
错误
查看完整题目与答案
【单选题】NTFS文件系统在 MBR 的分区模式下所能管理的最大分区容量为()
A.
4TB
B.
128TB
C.
1TB
D.
2TB
查看完整题目与答案
【单选题】隙感染中何种最容易导致呼吸困难
A.
眶下间隙
B.
翼颌间隙
C.
咬肌间隙
D.
下颌下间隙
E.
口底蜂窝织炎
查看完整题目与答案
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