[名词解释] 暂时性染发剂

采样器开口宽度应为煤的最大粒度的（）倍 ["1.5～2","2.5～3","3.5～4","无具体要求"] 标准规定采样精密度与煤的灰分值有关的煤是（） ["洗煤","精煤","毛煤","原煤"] 半永久性染发剂 热电偶通常用来测量（）500°C的温度。 ["A、高于等于；","B、低于等于；","C、等于；","D、不等于。"] GB475-2008《商品煤人工采取方法》实施于（）年 ["1996","2007","2009","2008"] 暂时性染发剂