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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Critical sanding prediction model with perforated well completion was established using the theory and method of rock mechanics based on rock burst criterion.

以岩石破坏准则为基础，采用岩石力学的理论和方法，建立了射孔完井临界出砂预测模型。

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The predicted transmission loss of perforated tube silencers using the finite element method and experimental results are compared and showed good agreement.

使用有限元法计算穿孔管消声器的传递损失，并与实验测量结果进行了比较，二者吻合良好。

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