一、Homogeneous And Heterogeneous 托福听力原文： NARRATOR: Listen to part of a lecture in a chemistry class. MALE PROFESSOR: So, just to sum up, matter is anything that has mass and volume, right? Anything ...

A homogeneous mixture is also known as a solution. It is a substance composed of two or more substances that are distributed uniformly at a molecular level or microscopic. In easier terms, homogeneous ...

Immunoassays are biochemical tests used to detect the presence or concentration of an analyte in a biological sample via an antibody-antigen reaction. They are widely used to perform screening and ...