Commercial advertisements whose contents comply with the requirements for offers are deemed to be offers. 商业广告的内容符合要约规定的，视为要约· Article 16:An offer becomes effective when it reaches the offeree. 第十六条要约到达受要约人时生效。 If a contract is concluded by using the electrically or electronically transmitted document method, and the addressee designates a specific system to receive the electrically or electronically transmitted document,the document is deemed to have reached the offeree when it enters the designated system.If no specific system is designated,the document is deemed to have reached the offeree at its first entry into any of the offeree's systems. 采用数据电文形式订立合同，收件人指定特定系统接收数据电文的，该数据电文进入该特 定系统的时间，视为到达时间；未指定特定系统的，该数据电文进入收件人的任何系统的 首次时间，视为到达时间。 Article 17:An offer may be withdrawn.The notification of the withdrawal of the offer shall reach the offeree before or at the same time as the offer. 第十七条要约可以撤回·撤回要约的通知应当在要约到达受要约人之前或者与要约同时到 达受要约人。 Article 18:An offer may be revoked.The notice of revocation of the offer shall reach the offeree before he has dispatched an acceptance. 第十八条要约可以撤销。撤销要约的通知应当在受要约人发出承诺通知之前到达受要约 人 Article 19:An offer may not be revoked if: 第十九条有下列情形之一的，要约不得撤销： (1)the offeror has clearly indicated,whether by stating a fixed time for acceptance or otherwise, that it is irrevocable;or (一)要约人确定了承诺期限或者以其他形式明示要约不可撤销； (2)the offeree had reason to believe that the offer was irrevocable and has already made preparations to perform the contract (二)受要约人有理由认为要约是不可撤销的，并已经为履行合同作了准备工作。 55 Commercial advertisements whose contents comply with the requirements for offers are deemed to be offers. 商业广告的内容符合要约规定的，视为要约。 Article 16: An offer becomes effective when it reaches the offeree. 第十六条要约到达受要约人时生效。 If a contract is concluded by using the electrically or electronically transmitted document method, and the addressee designates a specific system to receive the electrically or electronically transmitted document, the document is deemed to have reached the offeree when it enters the designated system. If no specific system is designated, the document is deemed to have reached the offeree at its first entry into any of the offeree’s systems. 采用数据电文形式订立合同，收件人指定特定系统接收数据电文的，该数据电文进入该特 定系统的时间，视为到达时间；未指定特定系统的，该数据电文进入收件人的任何系统的 首次时间，视为到达时间。 Article 17: An offer may be withdrawn. The notification of the withdrawal of the offer shall reach the offeree before or at the same time as the offer. 第十七条要约可以撤回。撤回要约的通知应当在要约到达受要约人之前或者与要约同时到 达受要约人。 Article 18: An offer may be revoked. The notice of revocation of the offer shall reach the offeree before he has dispatched an acceptance. 第十八条要约可以撤销。撤销要约的通知应当在受要约人发出承诺通知之前到达受要约 人。 Article 19: An offer may not be revoked if: 第十九条有下列情形之一的，要约不得撤销： (1) the offeror has clearly indicated, whether by stating a fixed time for acceptance or otherwise, that it is irrevocable; or （一）要约人确定了承诺期限或者以其他形式明示要约不可撤销； (2) the offeree had reason to believe that the offer was irrevocable and has already made preparations to perform the contract. （二）受要约人有理由认为要约是不可撤销的，并已经为履行合同作了准备工作