发布时间:2025-01-23 03:09:38
钢筋混凝土框架结构抗震等级划分为四级,一级比四级等级高,一级、二级、三级、四级表示其很严重、严重、较严重及一般的四个级别。
sleeping bag和sleep bag都是睡袋的意思 请问如何使用
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