履行义务是指合同中企业向客户销售商品、提供服务等的承诺，既包括合同中明确的承诺，也包括由于企业已公开宣布的政策、特定声明或以往的习惯做法等导致合同订立时客户合理预期企业将履行的承诺。
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企业与客户签订的合同含有应付客户对价的，应当将该应付对价冲减交易价格，并在确认相关收入与支付客户对价二者孰早的时点冲减当期收入。
A. 对
B. 错
【2008-20】Which of the following sentences expresses "probability"?
A. You must leave immediately.
B. You must be feeling rather tired.
C. You must be here by eight o'clock.
D. You must complete the reading assignment on time.
【2011-20】 The sentence that express OFFER is ________.
A. I’ll get some drinks. What’ll you have?
B. Does she need to book a ticket now?
C. May I know your name?
D. Can you return the book next week?
【2012-13】Which of the following sentences expresses WILLINGNESS?
A. By now she will be eating dinner.
B. I shall never do that again.
C. My brother will help you with the luggage.
D. You shall get a promotion.
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