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【简答题】
氨基酸是两性电解质,位于等电点时,不带电荷,当溶液PH小于等电点时,氨基酸带( )电荷,当溶液PH大于等电点时,氨基酸带( )电荷。
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【简答题】为 实现均匀梯度的磁场,两块相同的磁铁(磁铁截面积及表面感应强度相同)相对位置,即N极与N极相对,两磁铁之间留一等间距间隙,霍尔元件平行于磁铁放在该间隙的中轴上。间隙大小要根据测量范围和测量灵敏度要求而定,间隙越小,磁场梯度就越大,灵敏度就 ( )
【简答题】We Should All Grow Fat and Be Happy Here’s a familiar version of the boy-meets-girl situation. A young man has at last plucked up courage to invite a dazzling young lady out to dinner. She has accepte...
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【简答题】阅读理解。 High-tech machines have made life easier for millions around the world. However, some people still prefer low-tech ways of doing things. Here's an example of why this is happening. You can micro...
【简答题】High-tech machines have made life easier for millions around the world. However, some people still prefer low-tech ways of doing things. Here’s an example of why this is happening. You can microwave a...
【简答题】为 实现均匀梯度的磁场,两块相同的磁铁(磁铁截面积及表面感应强度相同)相对位置,即 N极与N极相对,两磁铁之间留一等间距间隙,霍尔元件平行于磁铁放在该间隙的中轴上。间隙大小要根据测量范围和测量灵敏度要求而定,间隙 () ,磁场梯度就越大,灵敏度 越高 。
【单选题】如图所示 , 一有限范围的匀强磁场 , 宽度为 d , 将一边长为 l 的正方形导线框以速度 v 向右匀速地通过磁场区域 , 若 d > l , 则导线框中不产生感应电流的时间应等于 ( )
A.
d/v
B.
L/V
C.
(d-L)/v
D.
(d-2l)/v
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