发布时间:2025-01-31 17:38:45
瓷白的玻璃胶用得时间久了,一般都会发黄,若用纯白色的玻璃胶的话,效果会好一点的。
可把原来的玻璃胶用美工刀片割除,然后重新打上白色的玻璃胶。
教学楼中有一排四间相同的教室人可以沿教室外的走道直走到尽头出口用数学模型来分析人员疏散所用时间
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