Fundamental principles of handwriting authentication include early theory of writing activity habits, theory of handwriting psychological activity and other methods.

笔迹鉴定的基本原理除了早期的书写动作习惯论外，还有笔迹心理活动论等其他理论。

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A document may be signed by handwriting, facsimile signature, perforated signature, stamp, symbol or any other mechanical or electronic method of authentication.

单据可以通过手签、签样印制、穿孔签字、盖章、符号表示的方式签署，也可以通过其它任何机械或电子证实的方法签署。

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A document may be signed by handwriting, facsimile signature, perforated signature, stamp, symbol or any other mechanical or electronic method of authentication.

单据可以通过手签、签样印制、穿孔签字、盖章、符号表示的方式签署，也可以通过其它任何机械或电子证实的方法签署。

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