Đố vui về an toàn phòng cháy (12.4)
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1. Xây đập trên sông Tiền Đường – hai từ diễn tả khái niệm an toàn.2. Tai nạn máy bay – thành ngữ gồm bốn chữ.
1. Chống ẩm.
2. Tai họa từ trên trời rơi xuống
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