题目

英语翻译
LD50/LC50 values are commonly found on Material Safety Data Sheets (MSDS) for specific chemicals and products.You must review MSDS sheets and other reference materials before initiating work with all unfamiliar chemicals.You should also be familiar with the exposure limits (TLVs) for specific chemicals used in the work area.Toxic materials should be opened and handled only within a functioning ventilation enclosure,such as a laboratory hood,unless alternate work practices can achieve an equal or greater level of personal protection.

提问时间：2021-03-26

答案

半数致死量或浓度的测试值一般基于特殊化学制品的安全技术数据表.在你开始使用不熟悉的化学品之前,你必须了解安全技术说数据表和其他的参考资料. 你也需要熟悉特殊化学品在工作环境中的曝露限度. 有毒物质必须在有通风设备的情况下打开和处理,比如实验室通风柜,至少也要轮流工作,来达到一个相对或者更好的个人能防护
希望你能够采纳~~