【正文】 eir respective liabilities accordingly.Article 59 Remedies in Case of Collusion in Bad FaithWhere the parties colluded in bad faith, thereby harming the interests of the state, the collective or a third person, any property acquired as a result shall be turned over to the state or be returned to the collective or the third person.Chapter Four Performance of ContractsArticle 60 Full Performance。s Court or arbitration institution may not cancel the contract instead.Article 55 Extinguishment of Cancellation RightA party39。s Court or an arbitration institution for amendment or cancellation of a contract if:(i) the contract was concluded due to a material mistake。(v) The contract violates a mandatory provision of any law or administrative regulation.Article 53 Invalidity of Certain Exculpatory ProvisionsThe following exculpatory provisions in a contract are invalid(i) excluding one party39。 where a party improperly facilitated the satisfaction of a condition, the condition is deemed not to have been satisfied.Article 46 Contract TermThe parties may prescribe a term for a contract. A contract subject to a time of mencement bees effective at such time. A contract subject to a time of expiration is extinguished at such time.Article 47 Contract by Person with Limited Capacity A contract concluded by a person with limited capacity for civil act is valid upon ratification by the legal agent thereof, provided that a contract from which such person accrues benefits only or the conclusion of which is appropriate for his age, intelligence or mental health does not require ratification by his legal agent.The other party may demand that the legal agent ratify the contract within one month. If the legal agent fails to manifest his intention, he is deemed to have declined to ratify the contract. Prior to ratification of the contract, the other party in good faith is entitled to cancel the contract. Cancellation shall be effected by notification.Article 48 Contract by Unauthorized AgentAbsent ratification by the principal, a contract concluded on his behalf by a person who lacked agency authority, who acted beyond his agency authority or whose agency authority was extinguished is not binding upon the principal unless ratified by him, and the person performing such act is liable. The other party may demand that the principal ratify the contract within one month. Where the principal fails to manifest his intention, he is deemed to have declined to ratify the contract. Prior to ratification of the contract, the other party in good faith is entitled to cancel the contract. Cancellation shall be effected by notification.Article 49 Contract by Person with Apparent Agency AuthorityWhere the person lacking agency authority, acting beyond his agency authority, or whose agency authority was extinguished concluded a contract in the name of the principal, if it was reasonable for the other party to believe that the person performing the act had agency authority, such act of agency is valid. Article 50 Contract Executed by Legal RepresentativeWhere the legal representative or the personincharge of a legal person or an organization of any other nature entered into a contract acting beyond his scope of authority, unless the other party knew or should have known that he was acting beyond his scope of authority, such act of representation is valid.Article 51 Unauthorized Disposal of Property through ContractWhere a piece of property belonging to another person was disposed of by a person without the power to do so, such contract is nevertheless valid once the person with the power to its disposal has ratified the contract, or if the person lacking the power to dispose of it when the contract was concluded has subsequently acquired such power.Article 52 Invalidating CircumstancesA contract is invalid in any of the following circumstances:(i) One party induced conclusion of the contract through fraud or duress, thereby harming the interests of the state。(iii) any other conduct which violates the principle of good faith.Article 43 Trade Secrets。 Duty to Call AttentionWhere a contract is concluded by way of standard terms, the party supplying the standard terms shall abide by the principle of fairness in prescribing the rights and obligations of the parties and shall, in a reasonable manner, call the other party39。 Confirmation LetterWhere the parties enter into a contract by the exchange of letters or electronic messages, one party may require execution of a confirmation letter before the contract is formed. The contract is formed upon execution of the confirmation letter. Article 34 Place of Formation。(iv) The offeree makes a material change to the terms of the offer.Article 21 Definition of AcceptanceAn acceptance is the offeree39。s systems is deemed its time of arrival.Article 17 Withdrawal of OfferAn offer may be withdrawn. The notice of withdrawal shall reach the offeree before or at the same time as the offer.Article 18 Revocation of OfferAn offer may be revoked. The notice of revocation shall reach the offeree before it has dispatched a notice of acceptance.Article 19 Irrevocable OfferAn offer may not be revoked:(i) if it expressly indicates, whether by stating a fixed time for acceptance or otherwise, that it is irrevocable。s manifestation of intention to enter into a contract with the other party, which shall ply with the following:(i) Its terms are specific and definite。(v) price or remuneration。 Writing RequirementA contract may be made in a writing, in an oral conversation, as well as in any other form.A contract shall be in writing if a relevant law or administrative regulation so requires. A contract shall be in writing if the parties have so agreed.Article 11 Definition of WritingA writing means a memorandum of contract, letter or electronic message (including telegram, telex, facsimile, electronic data exchange and electro