Emily2018-10-11 10:51:32
Emily老师您好，这道题中，感觉B和C都说的不是太对。虽然这题答案是选了C。这题是不是有点小问题？题目解析中提到的是：The margin adjustments are made based on the settlement price, which is calculated as the average trade price over a specific closing period at the end of the trading day. The length of the closing period is set by the exchange。谢谢。
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Galina2018-10-11 17:01:00
Galina嗯。选项表述不严密。
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