变压器铁芯及其金属构件必须可靠接地是为了防止变压器在运行或试验时，由于静电感应而在铁芯或其他金属构件中产生悬浮电位，造成对地放电。
参考答案：对
Who did the teacher______ an article for the wall newspaper?[ ]
A. has write
B. has written
C. have write
D. have written
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