煤的灰分产率是煤中矿物质的衍生物。_爱下问搜题

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问题判断题

煤的灰分产率是煤中矿物质的衍生物。

答案

参考答案：对

选择题

Physics _____ more interesting than math, I think. [ ]

A. are

B. is

C. was

D. were

问答题论述题

简述人工照明的卫生要求。