Вопрос из теста по предмету Английский язык

Question

Ответьте на вопрос:

What is the least useful feature in identification purposes?

Answer

Luster, which is described in such terms as metallic, glassy etc.

Answer

Colour, which is used in diagnostic properties as well.

Answer

Hardness, which refers to the ability of minerals to scratch or to be scratched.

Answer

Cleavage, which is the property of minerals to split along one or more series of parallel planes.

Ответьте на вопрос: What is the least useful feature in identification purposes: ответ на тест 628855 - Английский язык