Copper is the principal alloying element of aluminium alloy. Accurate and quick determination of its content is very important for research and production of aluminum alloy.
铜是铝合金中的主要合金元素，准确、快速测定其含量对科研与生产具有重要意义。
The method of lactose mass fraction based on the laser refraction was adopted for quick and accurate determination of lactose content in the milk, and the accuracy is 0.
为了快速准确测量牛乳乳糖成分，依据光折射理论，提出了牛乳乳糖质量分数的快速准确测量方法。
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