题目

设NA代表阿伏伽德罗常数，下列说法正确的是（ ） A．在密闭容器中加入0.5 mol N2和1.5 mol H2，充分反应后可得到NH3分子数为NA B．1molC2H6中含有6NA个共价键 C．常温常压下，14.0g由C2H4和C3H6组成的混合气体原子总数为3NA D．标准状况下，11.2L CCl4所含的分子数为0.5NA 答案：CThe night was cold. We had to put a camping blanket around us. (保持句意基本不变)The night was __________ cold __________ we had to put a camping blanket around us.