发布时间:2025-01-17 22:01:54
保温管的体积=(内径+壁厚)*壁厚*3.14*延长米。(0.048+0.03)*0.03*3.1416*2= 0.01470269立方米。
一般陶瓷是不透明的,但是光学陶瓷像玻璃一样透明,陶瓷如何才能做成透明的
2025-01-17 22:01:54 2025-01-17 22:01:54 2025-01-17 22:01:54 2025-01-17 22:01:54 2025-01-17 22:01:54 2025-01-17 22:01:54 2025-01-17 22:01:54 2025-01-17 22:01:54 2025-01-17 22:01:54农村guo pai的那个东西叫什么 就是蒸馒头时候先把生的馒头放上然后再端着放锅里
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