问答题
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翻译：A portion of the sample is used to determine the gravity of the oil expressed in AIP unit the lighter the oil, the higher the API gravity .In most cases the price paid for the coude is determined in prat by the API gravity, hence ,the importance of careful gravity determination in each instance.
【参考答案】
对原样样品的比重进行测试并用AP 制单位表示出来。原油越轻，重度越高。在多数情况下原油的市场价受重度的影响。所以测定原油......
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