A:How can I have
B:How would I have
C:Why should I have
D:Why must I have
如图是“探究某物质熔化和凝固规律”的实验图象,下列说法正确的是( )
分子是____ 微粒.原子是____ 微粒.分子与原子的主要区别在于____ .