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【单选题】
关于冗余度，以下说法错误的是A.
冗余度表示给定信源在实际发出消息包含的多余信息
B.
冗余度表示不肯定性的程度
C.
信源存在冗余度的原因是信源符号中存在统计不均匀性和相关性
D.
为了提高传输效率，往往需要压缩冗余
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【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 。
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