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。

youdao

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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The extent of damage to computer virus depends on it is operating system type, shell type or intrusive or source type.

病毒对计算机的破坏程度取决于它是操作系统型、外壳型还是入侵型或源码型。

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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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There were no serious injuries from the rounds, which included a modified shotgun shell that fires small rubber pellets as well as a type of bean-bag projectile, said Army Col.

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