气相色变法测定水中有机磷农药时,提取有机磷农药常用的萃取剂是()。A.氯甲烷 B.三 发布时间:2017-07-21 20:17 │ 来源:www.tikuol.com 题型:单项选择题 问题: 气相色变法测定水中有机磷农药时,提取有机磷农药常用的萃取剂是()。A.氯甲烷B.三氯甲烷C.四氯化碳
题型:单项选择题 —________soccer ball do you think it is? —It must be Tom's. [ ]A. Where B. Which C. Whose D. How 查看答案