S end face sealing piece on-off not leak, mechanical properties and reliable.
端面密封片启闭不泄漏，机械性能可靠。
The criteria of pipe selection include good physical and mechanical properties, high intensity, and sustaining and water supply reliable.
选择给水用管道的原则是：物理机械性能良好，强度高，保证连续、安全、可靠供水；
In contrast, the mechanical properties of plastic and metal mines vary significantly from those of the soil, which may make acoustic excitation a more reliable mechanism to detect mines.
相对而言，不管是塑料地雷还是金属地雷，它们与土壤的机械特性差别较大，这使得利用声波探雷显得更为可靠。
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