暗箱型万花筒（chamber Scope）暗箱型万花筒点击此处查看全部新闻图片 万花筒的主体前端装着内有标的物（芯），被称为暗箱的盒子，通过旋转，使图案瞬息万变，...
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The improved technique of chamber blasting is beneficial to the extending of its scope of applications, and provided references for the similar engineering.
这种改进的硐室爆破技术有利于扩大其适用范围，对同类工程具有参考价值。
The improved technique of chamber blasting is beneficial to the extending of its scope of applications, and provided references fo…
这种改进的硐室爆破技术有利于扩大其适用范围，对同类工程具有参考价值。
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