How to identify the inferior disposable tableware. Mr. Liu doesn't want to eat out in the cold weather recently. He often orders takeout, but he finds that some takeout boxes have quality problems and smell like poison. This is also a common concern of many working people.

　　据了解，一次性饭盒应由高纯聚丙烯塑料制成。它们是圆的，半透明的，像米一样的粒子，有弹性，能承受高温，浸泡在正己烷和乙酸溶液中，不会发生反应。劣质的一次性饭盒气味刺鼻;轻轻撕破;褶皱会出现白蜡;撕裂后易进水;热会变形，还会有油水渗漏的现象。质量差的一次性筷子保质期长达4个月，之后可能会被细菌感染。市民在使用时，可以闻到筷子的味道，如果有硫酸味，更好不要使用。此外，用冷水清洗筷子表面可以减少残留的二氧化硫。

　　It is understood that disposable lunch boxes should be made of high-purity polypropylene plastic. They are round, translucent, rice like particles, elastic, can withstand high temperature, immersed in n-hexane and acetic acid solution, will not react. The smell of inferior disposable lunch box is pungent; it is slightly torn; white wax will appear in the fold; it is easy to enter water after tearing; the heat will deform and there will be oil and water leakage. Poor quality disposable chopsticks have a shelf life of up to four months, after which they may be infected by bacteria. People can smell chopsticks when using them. If there is a smell of sulfuric acid, it is better not to use them. In addition, using cold water to clean the surface of chopsticks can reduce the residual sulfur dioxide.