interstratified coal samplestratified coal seam sample分层: lamination; layering; strati ...煤: coal样: appearance; shape煤层煤样采取方法: sampling of coal in seam煤样: coal sample; coal-sample下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:分层煤样，即可在微信中查询翻译
