交换契约房屋交换行为发生后，是由房屋产权承受人凭当事人双方订立的合同，办理缴纳契税和房屋变更登记手续，其差额价款按买卖契税税率课征的行为。
房子的买方和卖方办妥法律手续即可交换契约。
When the legal formalities have been settled, the buyer and seller of a house can exchange contracts, ie to complete their agreement legally.
汽车租赁市场转移那里你可以走出汽车租赁、交换契约、进入一个短期还是长期租赁、汽车租赁做研究…
The auto lease transfer marketplace where you can get out of a car lease, exchange a lease, enter a short or long term lease, and do auto lease research.
最简单的消费者契约，就是对服务提供者与消费者之间交换的消息作断言。
The simplest consumer contracts make assertions about the messages exchanged between service providers and consumers.
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