一种学生防踩踏事件楼梯行人计数报警器

Publisher: 国家哲学社会科学学术期刊数据库

E-ISSN: 1673-940x|volume|8|78-78

ISSN: 1673-940x

Source: 科技创新与品牌, Vol.volume, Iss.8, 2016-01, pp. : 78-78

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Abstract