grade of coal
查询英语单词中文释义、音标、发音和例句。
grade of coal
英
[grade of coal]
美
[grade of coal]
中文释义
煤分级;煤级;煤炭分类;煤炭品质分类
单词分析
单词结构:
grade of coal
字母数:13
记忆提示
🎯 重点记忆:
- 单词拼写:grade of coal
- 核心含义:煤分级;煤级;煤炭分类;煤炭品质分类
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更新时间:2026-09-01 23:11:58