lower-grade coal的意思|示意
美 / /
英 / /
劣质煤
lower-grade coal的网络常见释义
劣质煤 ... lower frequency noise 低频噪音，低频干扰 lower-grade coal 劣质煤 lower grid 下栅[格]板 ...
lower-grade coal相关例句
The coal has lower metamorphic grade with high ash.
煤的变质程度低，灰分高。