题目内容

商业票据和银行承兑汇票都是无担保的信用凭证。()

A. 正确
B. 错误

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AskForCents.com is operated on the basis of

A. computers that can tell people information about baseball schedules.
B. a software that allows humans to provide answers through computers.
C. the flexibility of an algorithm-driven system developed by Mr. Heitler.
D. a software that allows people to solve problems through the network.

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