An element in product safety is the fabrication of stress or strain-free glassapparatus and systems.
一个要素，产品安全是捏造的应力应变或无玻璃仪器和系统。
2
Invisible to the naked eye, the strain never-the-less is present and is a potential point of failure in the glassapparatus unless relieved.
无形的，以肉眼，该品种在不停的少，是当前和是一个潜在的故障点，在玻璃器具，除非宽慰。
3
Objective: a simple apparatus for volatile oil determination is designed with the use of common glassapparatus in order to refreshen the shortcoming of pharmacopoeia device.