A:How are you
B:Where is it
C:What’s happening
D:Are you wrong
对一定质量的气体,若用n表示单位时间内与器壁单位面积碰撞的分子数,则( )
陶瓷和玻璃都属于传统无机非金属材料.在陶瓷发明以前,人们用篮子、皮革袋子、木碗等来储存食物.
I like to eat apples, __________ I don't often eat them.