FICO自己的人说的: http://articles.moneycentral.msn.com/Banking/YourCreditRating/CardsThatHurtYourCreditRating.aspx
Cards that hurt your credit rating
A no-limit credit card can damage you -- even if you pay it off in full
every month -- because the most commonly used method of determining risk is
flawed.
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Message BoardArticle IndexBy Bankrate.com
A no-limit credit card, often considered a valuable perk f