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【判断题】
集合A上满足对称性和传递性的关系R,一定也满足自反性。
A.
正确
B.
错误
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【简答题】时间继电器的作用是(),中间继电器的作用是()和(),信号继电器的作用是(),在继电保护装置中,它们都采用()式结构。
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She wanted to buy a new bike.
B.
She wanted to go traveling.
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She wanted to have a dog.
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【简答题】说明中间继电器的作用。
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【多选题】中间继电器的作用
A.
扩大接点容量
B.
增加接点数量
C.
延时
D.
发信号
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【简答题】A.She wanted to buy something useful. B.She wanted to buy something extraordinary. C.$he wanted to buy something expensive. D.$he wanted to buy something valuable.
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【单选题】20110262在Access数据库表中有一个姓名字段,如果要查找该字段中姓李的记录,则查询条件表达式为(62)
A.
Not“李”
B.
Like“李*”
C.
IN(“李”)
D.
“李”
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【简答题】中间继电器的作用
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【简答题】什么是电流继电器、电压继电器和中间继电器?中间继电器的作用是什么?
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She wanted to buy a new bike.
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【单选题】Why did Carolyn set up her own consultancy?
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【简答题】Why did the woman make the phone call? A) She wanted to chat with Wang Lin. B) She wanted to complain about their terrible after-sales service. C) She wanted to be an English telephone operator. D) Sh...
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【多选题】中间继电器的作用
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扩大接点容量
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【简答题】A.She wanted to buy something useful. B.She wanted to buy something extraordinary. C.$he wanted to buy something expensive. D.$he wanted to buy something valuable.
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B.
Like“李*”
C.
IN(“李”)
D.
“李”
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