短时间接触容许浓度是指在遵守时间加权平均容许浓度前提下容许短时间接触的浓度,其中短时 发布时间:2019-03-18 09:23 │ 来源:www.tikuol.com 题型:单项选择题 问题: 短时间接触容许浓度是指在遵守时间加权平均容许浓度前提下容许短时间接触的浓度,其中短时间指( )。A.5minB.10minC.15minD.20min
题型:单项选择题 I ________ my hometown for a long time. I really miss it![ ]A. leftB. went away from C. have left D. have been away from 查看答案