A new idea that the distribution movement of electric charge in the cr ack tip end being associated with concrete fracture propagation produce electromagnetic emission is brought up.
对混凝土断裂时的电磁发射现象进行了理论研究，研究表明：混凝土断裂电磁发射是由于裂纹尖端电荷随着裂纹的加速扩展运动而产生。
In most cases we don't have to worry about it. If we don't get ACK try 10 times before giving up.
在大部分的情况下，我们不需要为它担忧，在拿不到正确的应答之前要尝试十次。
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