题目

1. —Do you have a library?—Yes. The library is on the first floor. It’s under Classroom 1.2. —Where is the music room?—It’s next to the library.3. —Where is the teachers’ office?—It’ s on the second floor, next to Classroom 1.4. —Where is Classroom 2?—It’s next to the gym.5. —Do you have a computer room?—Yes. It’s next to the art room.Art Room【1】【2】Classroom 1【3】Gym【4】【5】用NA表示阿伏加德罗常数的值，下列说法中正确的是A．1 mol O3所含有的原子数为3NAB．18克H2O中,原子数为2NAC．22.4 L氯化氢所含的原子数为2NA D．NA个 CH4分子的质量为16g/mol