For the following statement about the heat conduction coefficient, which is wrong： （ ）

A、For the same substance, the heat conduction coefficient in different directions or facets can be different.
B、It is related to the type, temperature, and pressure of the substance.
C、It decreases with temperature for most kinds of liquids, except water and glycerin.
D、Graphite has low heat conduction coefficient so it is usually used as the material for thermal insulator.