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【单选题】
霍尔效应实验里,开机前,两个电流旋钮应()A.
沿逆时针方向选到底
B.
沿顺时针方向选到底
C.
选至任何位置
D.
不清楚
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【单选题】需要设置定距分型拉紧机构的侧抽芯结构是( )。
A.
斜导柱与滑块同在定模的结构
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