随着全球食品安全和质量标准的不断提高，农业产品的检测与分级技术日益受到重视。鸡蛋作为一种重要的蛋白质来源 ...

The currency value of the SDR is determined by summing the values in U.S. dollars, based on market exchange rates, of a basket of major currencies (the U.S. dollar, Euro, Japanese yen, pound sterling ...