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问题 单项选择题

对于感性负载的整流电路，要在感性负载两端并联一个（），使晶闸管在电源电压接近零值时能可靠地关断。

A、正向二极管

B、反向二极管

C、三极管

D、滤波电抗器

答案

参考答案：B

填空题

Only Mother Love is true love. It gives everybody everything all 56._________ life. When you are still a baby, Mother takes good care of you as possible. In your walking hours she always holds you in her arms. When you are 57.________, she stops her work right now to look after you day and night and 58._________ about herself. When you are growing up day by day, she feels very happy. When you are 59.__________ enough go to school, Mother still looks after you all the time. On cold winter days, she always 60.________ you to put on more clothes. She always stands in the wind 61._________ for you back from school. When you hurry to leave home for school with little breakfast, she always feels 62.________ about you at home. She usually knows about your 63.__________ and spends much money on your school things. When you do well at school, you will see the brightest smile on her face.

Mother is 64.__________ ready to give everything she has to her children, not to receive. What true love that is in the 65.__________! We will remember Mother Love for ever!
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问答题 简答题

具有移动夹具的多工位组合机床有哪几种类型？
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