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问题 填空题

奥斯特发现了______之后，法拉第发现了______现象，进一步揭示了电和磁的联系，导致了______的发明．

答案

奥斯特发现了电生磁之后，法拉第发现了电磁感应现象，进一步提示了电和磁的联系，导致了发电机的发明．

故答案为：电生磁；电磁感应；发电机．

判断题

离心泵流量调节可以通过改变管路特性曲线或改变泵的特性曲线达到。（）
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听力题

Mother’s love is great. She gives her children everything all her life. When you are still a baby, Mother takes good care of you . When you are ____66____（生病的), she looks after you day and night and ____67____(忘记)about herself. When you are growing up day by day , she feels very happy . When you are ___68_____(大)enough to go to school , Mother still looks after you all the time. On cold winter days she always ____69____(告诉)you to put on more clothes. She always stands in the wind waiting for you to come back from ____70___(学校).When you hurry to leave home for school ____71____(没有)breakfast , she always feels worried about you at home. She ____72____(通常) knows about your study and spends much money on your school things . When you do ____73____(好) at school , you will see the brightest smile on her face.

Mother is always ready to give ____74____(一切) she has to her children . What great love it is in the ___75_____(世界)!
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