题目内容

剩磁的磁场强度取决于工件的磁导率

A. 正确
B. 错误

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A. 通畅气道
B. 人工呼吸
C. 胸外心脏按压
D. 高压氧舱救治

A. besides the polar regions
B. including the North Pole and the South Pole
C. above 70°N and below 70°S
D. as for north and south as 70°