题目

Justunderwater grass floats on the surface if it loses its roots, a nation is lost without its memories. A . since B . while C . as D . when 答案：C下列说法不正确的是 （ ）A．丁达尔效应可用于鉴别胶体和溶液B．胶体粒子的直径在1~100 nm之间C．胶体一定是混合物D．将FeCl3稀溶液溶于冷水即可制得Fe(OH)3胶体