根据《诗经》中对周朝祖先后稷歌颂的内容,周朝特别重视的行业是()A、重工业 B、轻工 发布时间:2020-06-24 23:24 │ 来源:www.tikuol.com 题型:单项选择题 问题: 根据《诗经》中对周朝祖先后稷歌颂的内容,周朝特别重视的行业是()A、重工业B、轻工业C、农业D、商业
题型:单项选择题 — Cathy, I have cleaned the room for you.— Thanks. You _____ it. I could manage it myself. [ ]A. didn't need to do B. needn't have done C. mustn't do D. shouldn't have done 查看答案
题型:单项选择题 将固体NH4Br置于密闭容器中,在某温度下,发生下列可逆反应: NH4Br(s) NH3(g)+HBr(g) 2HBr(g) Br2(g)+H2(g) 。2min后,测得c(H2)=0.5mol/L,c(HBr)=4mol/L,若上述反应速率用(NH3)表示,下列反应速率正确的是A.0.5mol/(L·min)B.2.5 mol/(L·min)C.2 mol/(L·min)D.5 mol/(L·min) 查看答案