纳氏试剂光度法测定氨氮预蒸馏时,要调整水样的pH至()。A、4~5.4 B、5~6. 发布时间:2017-04-09 21:56 │ 来源:www.tikuol.com 题型:单项选择题 问题: 纳氏试剂光度法测定氨氮预蒸馏时,要调整水样的pH至()。A、4~5.4B、5~6.4C、6~7.4D、7~8.4
题型:单项选择题 — Where is the broom?— It's ____________ the house, ____________ the door. [ ]A. behind, inB. in, behindC. after, behind 查看答案