为了治理废水中Cr2O72-的污染,常先加入试剂使之变为Cr3+,该试剂为
将22.4L某气态氮氧化合物与足量的灼热铜粉完全反应后,气体体积11.2L(体积均在相同条件下测定),则该氮氧化合物的化学式为
在一定温度下,反应 的平衡常数为10。若将1.0的通入体积为1.0的密闭容器中,在该温度时的最大分解率接近于
Now that we’ve discussed our problem, are people happy with the decisions _______?
Everybody was touched _____ words after they heard her moving story.
One of the most important questions they had to consider was _____ of public health.