单项选择题
A.高频感应加热B.中频感应加热C.低频感应加热
A.面心立方B.金刚石立方C.体心立方
A.WP≤0.045%，WS≤0.055%B.WP≤0.040%，WS≤0.040%C.WP≤0.035%，WS≤0.030%
A.10%B.11%C.12%
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