发布时间:2025-02-02 23:56:49
一般小区室外的给水为dn100~dn200、排水(雨水)管为dn400、污水管为dn300、消防管为dn100、喷淋(室内)最大为dn150、煤气dn80、电缆 每根dn100~dn200、电信 一般两根dn100~dn200.单位是mm
将吹足了气的气球嘴松开并放手快速放气后会感到气球变凉这是为什么
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