carbon-14是什么意思

用法例句

Experience of Construction about Bag Stopper of Oil Truck in Pipeline;

输油管道干线囊式封堵作业施工经验

The key technologies of bonnet tool polishing include: polishing machine technology, polishing process parameter optimization & polishing digital control algorithm.

气囊式抛光技术是一种新颖的先进抛光工艺方法,能实现光学表面的确定性加工。