Question

which state of matter is characterized by ionized particles, no definite shape or volume, and good electrical conductivity?
gas
liquid
plasma
solid

Explanation:

固体有固定形状和体积；液体有固定体积无固定形状；气体无固定形状和体积，但未电离；等离子体由电离粒子组成，无固定形状和体积且导电性好。

Answer:

plasma