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【判断题】
为了防止高频电磁场的影响,应采用导磁良好的金属材料作屏蔽层。A.
正确
B.
错误
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【简答题】When I try to understand ________ 选择When I try to understand ________ that prs so many Americans from being as happy as one might expect, it seems to me that there are two causes. A) why it does ...