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Black Chalk

1、黑垩

... 黑矿层；泥铁矿 black band 黑垩 black chalk 黑铜矿 black copper ...

2、一种用于制绘图铅笔的硬黑土

一种用于制绘图铅笔的硬黑土 black chalk铅笔 pencil 半硬铅笔 medium pencil; 彩色铅笔 coloured pencil; crayon; 软铅笔 soft pencil ..

black stump chalk黑炭粉

black k stump chalk黑炭粉

能源科学技术

地球科学

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