气体的粘度表示什么?
参考答案:
表示由于气体分子或质点之间存在吸引力和摩擦力而阻碍质点相互位移的特性。
A.“闻其声知其人”,说明可以根据音色来判断说话者
B.“震耳欲聋”,说明声音的响度大
C.“响鼓也要重锤敲”,说明声音是由振动产生的,且频率越大音调越高
D.“隔墙有耳”,说明固体能传声
你一定能根据所给词的适当形式填空的,试一试吧! (5分)
help one swim they America
小题1:Tomorrow is Sunday. Let’s go .
小题2:Are there any in your school? No, there aren’t.
小题3:Andy is a boy. We all like him.
小题4:Lily and Nick are twins. mother is a doctor.
小题5:Excuse me, where is the reading room? It’s on the floor of Building A.