发布时间:2025-01-27 14:00:06
外径的平方-内径的平方X0.7854(圆周率)X除以10得到100米的重量,再乘以你的原材料进价,就得到100米的合计价格,再除以100就得到你要的价格了。例(外径6MM内径4MM)的管子,6的平方=36,4的平方=16////36-16=20X0.7854X1除以10=1.57(你看下这个重量是很接近的吧)
凹字是什么结构查字典时蓟不知道它的读音又不知道它的部首可用什么查字法来查
2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06 2025-01-27 14:00:06