煤完全燃烧后所得的固体矿物残渣称为灰，灰重占干煤的百分率称为灰分。
参考答案：对
高锰酸钾法测定饲料中的钙时，计算结果含Ca量5%以上，允许相对偏差为（）。
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一般条款： General Terms： 1．合理差异：质地、重量、尺寸、花型、颜色均允许合理差异。对合理范围内的差异提出索赔，概不受理。 Reasonable tolerance in quality, weight, measurements, designs and colors is allowed, for which no claims will be entertained. 2．卖方免责：买方对下列各点所造成的后果承担全部责任：(甲)使用买方指定包装、花型图案等；(乙)不及时提供生产所需的商品规格或其他细则；(丙)不按时开信用证；(丁)信用证条款和售货确认书不同而不及时修改。 The buyers are to assume full responsibilities for and consequences arising from: (a)the use of packing, designs or pattern made to order; (b)late submission of specifications or any other details necessary for the execution of this Sales Confirmation; (c)late establishment of L/C; (d)late amendment of L/c inconsistent with the provisions of The Sales Confirmation. 