题型:问答题 简答题 She got so angry that she ran after them.She was soon________, but she continued to run. [ ]A . out of sight B. out of breathC. in sight D. in breath 查看答案
题型:问答题 简答题 现有含H2SO4和K2SO4均为0.5mol·L-1 的混合液300mL,为配制成含H2SO4和K2SO4物质的量浓度分别为2mol·L-1和0. 2mol·L-1的混合液,需加入溶质的物质的量浓度为18.4mol·L-1的浓硫酸多少毫升,然后再加水稀释? 查看答案