发布时间:2025-01-23 14:56:28
防盗门“猫眼”是由一个凹透镜和一个凸透镜组成,凹透镜在外,凸透镜在内,物镜是凹透镜,目镜是凸透镜,这样当人从内向外看时,可以看清楚外面的情景,而从外面向里面看时,就看不清里面。
刚买的广西铁木菜板打开一股难闻的气味拿盐水也泡了还是有太难闻了请高手指点怎么去味
2025-01-23 14:56:28 2025-01-23 14:56:28 2025-01-23 14:56:28 2025-01-23 14:56:28 2025-01-23 14:56:28 2025-01-23 14:56:28 2025-01-23 14:56:28 2025-01-23 14:56:28本人想开一个五金加工厂但怕接不到单特请问各位前辈有什么经验和
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