冷热交替浴桶 [医] contrast bath bucket
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纽约商交所对原油的保证金要求目前为每份1，000桶的合约需1万美元，经纪商通常在此基础上要求额外的保证金。
The Nymex margin requirement for crude is currently about $10,000 per 1,000-barrel contract, and brokerages typically tack additional margin onto that.
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