1. The invention also relates to an application for the ventiduct in a place where easily happens a blasting or an explosion, and an application of the contraposition aramid fiber in the ventiduct.
本发明还涉及上述通风管在易于发生爆破或爆炸的地点中的应用，以及对位芳族聚酰胺纤维在通风管中的应用。
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2. The invention also relates to an application for the ventiduct in a place where easily happens a blasting or an explosion, and an application of the contraposition aramid fiber in the ventiduct.
