The statement about various liquid preparations is incorrect.

The test site of this topic is the particle size and characteristics of various liquid preparation dispersion systems. The solution is a clear solution dispersed by molecules or ions, and the particle size in the dispersed system is less than 65438±0nm, which is a homogeneous thermodynamically stable system. The particle size of polymer solution and sol dispersion system is between 1 and 100 nm. Polymer solution is a transparent solution dispersed by molecules or ions, and it is a homogeneous thermodynamically stable system. Sol agent is a heterogeneous thermodynamically and dynamically unstable system dispersed by multimolecular aggregates. Emulsion is a multiphase system formed by dispersion of liquid particles, and the particle size in the dispersion system is larger than 100nm, which is heterogeneous and thermodynamically unstable. Suspension is a heterogeneous system dispersed by solid particles, and the particle size in the dispersed system is more than 500nm, which is heterogeneous and unstable in thermodynamics and kinetics. So choose C.