A：气体摩尔体积指1mol任何气体所占的体积约为22.4L
B：不同的气体，若体积不同，则它们所含的分子数必定也不同
C：一定温度和压强下，气态物质的体积大小主要由构成气体的分子大小决定
D：一定温度和压强下，气态物质的体积大小主要由构成气体的分子数决定
—________. The beaches there are very beautiful and we also enjoyed some fresh seafood.
Ben was busy taking a training class, ________ we had to wait for him for half an hour.
—How many people were there at the meeting?
—_______.
