alkanes造句

Methane and propane are alkanes.
甲烷和丙烷是烷烃。

The general uses of alkanes may be divided into three categories.
烷的一般用途可分为三个方面.

The straight - chain alkanes exacerbate the problem of engine " knock ".
直链烷烃使机器的 “ 爆震 ” 问题更加严重.

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