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如图5所示,均匀磁场中有一由半圆弧及其直径构成的导线框,半圆直径与磁场边缘重合;磁场方向垂直于半圆面(纸面)向里,磁感应强度大小为Bo。使该线框从静止开始绕过圆心O,垂直于半圆面的轴以角速度W匀速转动半周,在线框中产生感应电流。现使线框保持图中所示位置,磁感应强度大小随时间线性变化。为了产生与线框转动半周过程中同样大小的电流,磁感应强度随时间的变化率ΔB/Δt的大小应为( )。
下列选项中,不属于管理者面谈实施技巧的是:()
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()he was tired he went on working.
()he was tired he went on working.
I'm tired. I()working very hard.
I'm tired. I()working very hard.
He was so tired that he could not walk home any longer.→ He was ____ tired ____ ...
You look() What()you()?
You look() What()you()?
They were all very tired, but()of them would stop to take a rest.
I thought you might be tired, () is why I decided to help you.
I thought you might be tired, () is why I decided to help you.