Soft pitch is a black solid at a certain temperature , it will be solidified into a brittle solid with shell-like fracture.
常温下为黑色固体，在一定的温度下凝固成很脆的具有贝壳状断口的固体，呈玻璃相；
Soft pitch is a black solid at a certain temperature , it will be solidified into a brittle solid with shell-like fracture.
常温下为黑色固体，在一定的温度下凝固成很脆的具有贝壳状断口的固体，呈玻璃相；
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