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畜牧人

標題: 火焰原吸測石粉的pb 和cd 要扣背景嗎？ [打印本頁]
作者: Xiaox    時間: 2022-7-22 12:28
標題: 火焰原吸測石粉的pb 和cd 要扣背景嗎？
用火焰原吸測石粉的鉛會達到30mg/kg或更多，cd就是5到7mg/kg左右，扣背景的話這兩個元素又都總是未檢出，請問大伙們這到底要不要扣？兩個都需要扣嗎？



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亚洲日韩精品无码专区网站_亚洲日本一区二区_亚洲Av无码专区国产乱码DVD_亚洲精品永久在线观看 
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