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中文就是打电话的意思。
oldhorse 发表于 2015-1-22 23:45



   不带这么欺负新同学的。
什么是call呀?
eagle1 发表于 2015-1-22 23:30


Call Options

A Call option is a contract that gives the buyer the right to buy 100 shares of an underlying equity at a predetermined price (the strike price) for a preset period of time. The seller of a Call option is obligated to sell the underlying security if the Call buyer exercises his or her option to buy on or before the option expiration date.
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