如果你拿一个已经签了字的总建筑师或工程师绘图的硬拷贝,你可以相当肯定的图纸没有被修改,因为它被释放。但是,如果有人向您发送电子版图纸文件的,你怎么知道它是否有效?也许它已经改变了自上次批准。已实际被批准?有没有简单的方法来锁定该图纸所以没有更多的变化可以进行。输入数字签名。 它的强大,它很容易。只有3个步骤。 第一步:用鼠标绘制的笔迹。 SETP...
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