我们想买一台湿背式锅炉。

We want to buy a wetback boiler.

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砂砾是台背回填工程常用的回填材料之一。

The gravel is one of the most common materials for abutment backfilling.

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桥涵的台背回填是一道至关重要的工序。

It is an important procedure of re-fill up at platform back in bridge opening.

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桥涵的台背回填是一道至关重要的工序。

It is an important procedure of re-fill up at platform back in bridge opening.

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