横向
1
Mass per unit volume
4
Positive particle in nucleus
6
Measure of matter in an object
纵向
2
Smallest unit of an element
3
Element found in all living things
5
Form of thermal energy
7
Nerve cell in the brain
8
Curved glass that refracts light
Mass per unit volume
Positive particle in nucleus
Measure of matter in an object
Smallest unit of an element
Element found in all living things
Form of thermal energy
Nerve cell in the brain
Curved glass that refracts light