The wave propagation and power flow characteristics of a shell-type pipe with circumferential surface crack are investigated and the method for crack detection is proposed.

研究在外力激励下含有环向表面裂纹损伤的壳式管道的波传播与功率流特性，并给出裂纹识别方法。

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It is about the ring screw thread smoke channel of the boiler shell type gas tube in the boiler field.

锅壳式烟管锅炉烟管内置水管的环形螺纹烟道，它涉及锅炉领域。

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To see which environment variables are set in your shell, type printenv.

要查看您的shell中设置了哪些环境变量，键入printenv命令。

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He was wearing a grey hooded top that had lime green laces and front pocket, black shell-type tracksuit bottoms and white trainers.

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This means a body-on-frame type of construction in which the shell is bolted onto to a separate chassis.

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In Shell's 99-year history Van der Veer is the first of his type--a sole chief executive, ruling from headquarters in the Hague.

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