结果胸腺增生（ 1例）表现为胸腺区三角形软组织密度影，边界清楚；

Results Thymic hyperplasia (1 case) appeared as soft tissue density with a triangle shape margin in the region of thymus.

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矿井火区可燃性混合气体爆炸危险性的判断，目前常用单纯的瓦斯爆炸三角形判别法。

Methane explosion triangle method, which is commonly applied to judge the explosion risk of mixed inflammable gases in the mine fire district, considers only the main component gas.

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