Low - temperature boronizing base was studied for card wires with nitrogen atmosphere as outer layer protection.
对针布齿条氮基气氛外层保护低温渗硼的方法进行了研究。
The infiltration protection wall of deepest of over 80 meters at Xiaolangdi dam is the key project to control infiltration in the sand and gravel layer at dam base.
小浪底主坝防渗墙是坝基砂砾石覆盖层渗流控制的关键工程，最深达80多米。
The infiltration protection wall of deepest of over 80 meters at Xiaolangdi dam is the key project to control infiltration in the sand and gravel layer at dam base.
小浪底主坝防渗墙是坝基砂砾石覆盖层渗流控制的关键工程，最深达80多米。
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