题目

设NA表示阿伏加德罗常数的值，下列说法中正确的是               A．1 mol NH4+ 所含质子数为10NA B．10克氖气所含原子数约为6.02×1023C．标准状况下，22.4 L SO2所含的分子数为NAD．常温常压下，32 g O2和O3的混合气体所含原子数为2NA 答案：C-Where is Li Lei?-He was just seen ________ the building and go upstairs．A.come intoB.came intoC.coming intoD.to come into