发布时间:2025-01-23 03:29:05
井沿是圆环状,测内外直径,求出内外半径,大圆减小圆是圆环面积,再乘以井的深度,就是所需混凝土的体积。
请问有什么胶水可以把布和皮粘在一起的而且不会硬水洗也不会脱落
2025-01-23 03:29:05 2025-01-23 03:29:05 2025-01-23 03:29:05 2025-01-23 03:29:05 2025-01-23 03:29:05 2025-01-23 03:29:05 2025-01-23 03:29:05 2025-01-23 03:29:05 2025-01-23 03:29:05 2025-01-23 03:29:05 2025-01-23 03:29:05 2025-01-23 03:29:05 2025-01-23 03:29:05 2025-01-23 03:29:05 2025-01-23 03:29:05 2025-01-23 03:29:05