- 搜标题
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单项选择题
一Hello，this is Linda speaking．May I speak to Jim? —Yes，________．
一Hello，this is Linda speaking．May I speak to Jim? —Yes，________．
A.it is
B.speaking
C.I am Jim
D.that's me
A.May
B.
A.it
C.speaking
C.I
D.that's
B.
A.it
C.speaking
C.I
D.that's
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问答题
【简答题】铁芯的作用是什么?为什么要用厚0．35 mm、双面涂漆的硅钢片制造而成?
答案：
铁芯是变压器的主磁路又是它的机械骨架。为了提高磁路的导磁性能减少铁芯中的磁滞、涡流损耗铁芯一般用高磁导率的厚0．35mm...
