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【单选题】
为了减小交流铁心线圈的铁心损耗，线圈铁心由彼此绝缘的硅钢片叠成，主要是为了减小()损耗A.
涡流
B.
磁滞损耗和涡流损耗
C.
磁滞损耗
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【简答题】Here is pear for you. [ ] A a B an
【单选题】Help yourself to _______ . A. chickens and pears B. chickens and pear C. chicken and pear D. chicken and pears
A.
chickens and pears
B.
chickens and pear
C.
chicken and pear
D.
chicken and pears
【简答题】Pear International Co (Pear) is a manufacturer of electrical equipment. It has factories across the country and its customer base includes retailers as well as individuals, to whom direct sales are ma...
【单选题】The hyponyms of ‘vegetable’ are()
A.
banana, pear, jam
B.
pear, apple, banana
C.
cucumber, celery, peas
D.
tree, pine, elm
【简答题】rounder
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