何谓继电器的返回电流?

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问题:

何谓继电器的返回电流?

考点:除灰、除渣、电除尘考试电除尘设备检修(初级工)电除尘设备检修(初级工)题库
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(    )÷a5=a5;(    )÷(-a32=(-a23

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语法填空(每题1分,共10分)

One day Mary was busy working in her office in London when she received an E-mail from her friend Joan .In Joan’s e-mail, she persuaded Mary 小题1:______( look) for a flat in London for her. As she had 小题2:____ (little) money at her command than before, the flat had to be cheap, but it had to be modern, with elevators, gas lines. It had to be in the 小题3:_______ (east) part of London, with petrol and subway stations nearby. Though Mary found 小题4:_____difficult to find such a flat, she still went from one block to another, looking for a flat 小题5:_______would meet Joan’s requirements. Having tried too many times, Mary came up 小题6:______her boss and politely asked him 小题7:____advice. It was the first time that she 小题8:___________ (talk) with his boss about her personal problems. It happened that the boss just had such a flat for rent, so they quickly reached 小题9:____agreement. But to her surprise, when she e-mailed Joan, telling her the good news, Joan said that she had changed 小题10:_____ mind--- she was not returning to London.

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离合器处于结合状态时,以下部件之间

A.压盘、飞轮和从动盘之间没有压紧力;

B.飞轮和从动盘之间没有压紧力;

C.离合器处于滑磨状态

D.弹簧将压盘、飞轮及从动盘相互压紧

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可摘局部义齿蜡型的要求,下列错误的是()

A.人工牙与对颌牙有良好的关系

B.人工牙颊舌径宽度较天然牙小

C.人工牙舌侧不应有邻间隙

D.基托厚度约2mm,表面光滑

E.基托唇颊面应模仿牙龈突度外形舌侧呈凹斜面形

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分析石油产品残碳时,当试样在残碳炉中加热到()时,要立刻引火点燃蒸汽。

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