The designations A，B，C，D and E grades of cargo refer to the（）.<br>A:degrees of quality of petroleum products<br>B:flash point range and Reid vapor pressure index of petroleum products<br>C:grades of crude oil<br>D:pour point，color，and viscosity index of petroleum products

The designations A，B，C，D and E grades of cargo refer to the（）.
A:degrees of quality of petroleum products
B:flash point range and Reid vapor pressure index of petroleum products
C:grades of crude oil
D:pour point，color，and viscosity index of petroleum products

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