steel door; wooden door; aluminum door; security door; glass door; fireproof door; bulletproof door; blastproof door;
防盗门;玻璃门;木门;金属门;其他门窗五金;自动门;
steel door; wooden door; aluminum door; security door; glass door; fireproof door; bulletproof door; blastproof door;
防盗门;玻璃门;木门;金属门;其他门窗五金;自动门;
The technical measures and structure,applied principles of blastproof of ventilation shaft at excavating face,specific operational method and prospective effect are described.
介绍了掘进工作面防炮崩风筒的主要施及构、应原、这项的具体操作方法及达到的预期效果。
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