【正文】 unless the offeror timely advises the offeree that the acceptance is valid.Article 29 Delayed Transmission of AcceptanceIf the offeree dispatched its acceptance within the period for acceptance, and the acceptance, which would otherwise have reached the offeror in due time under normal circumstances, reaches the offeror after expiration of the period for acceptance due to any other reason, the acceptance is valid, unless the offeror timely advises the offeree that the acceptance has been rejected on grounds of the delay.Article 30 Acceptance Containing Material ChangeThe terms of the acceptance shall be identical to those of the offer. A purported acceptance dispatched by the offeree which materially alters the terms of the offer constitutes a new offer. A change in the subject matter, quantity, quality, price or remuneration, time, place and method of performance, liabilities for breach of contract or method of dispute resolution is a material change to the terms of the offer.Article 31 Acceptance Containing Nonmaterial Changes An acceptance containing nonmaterial changes to the terms of the offer is nevertheless valid and the terms thereof prevail as the terms of the contract, unless the offeror timely objects to such changes or the offer indicated that acceptance may not contain any change to the terms thereof.Article 32 Time of Formation in Case of Memorandum of ContractWhere the parties enter into a contract by a memorandum of contract, the contract is formed when it is signed or sealed by the parties. Article 33 Time of Formation in Case of Letters or Electronic Messages。 Electronic MessagesThe place where the acceptance bees effective is the place of formation of a contract.Where a contract is concluded by the exchange of electronic messages, the recipient39。 if the recipient does not have a main place of business, its habitual residence is the place of formation of the contract. If the parties have agreed otherwise, such agreement prevails.Article 35 Place of Formation in Case of Memorandum of ContractWhere a contract is concluded by a memorandum of contract, its place of formation is the place where the parties sign or seal the contract.Article 36 Effect of Failure to Conclude Contract in WritingWhere a contract is to be concluded by a writing as required by the relevant law or administrative regulation or as agreed by the parties, if the parties failed to conclude the contract in writing but one party has performed its main obligation and the other party has accepted the performance, the contract is formed.Article 37 Effect of Failure to Sign in Case of Memorandum of ContractWhere a contract is to be concluded by a memorandum of contract, if prior to signing or sealing of the contract, one party has performed its main obligation and the other party has accepted the performance, the contract is formed.Article 38 Contract under State Mandatory PlanWhere the state has, in light of its requirements, issued a mandatory plan or state purchase order, the relevant legal persons and other organizations shall enter into a contract based on the rights and obligations of the parties prescribed by the relevant laws and administrative regulations.Article 39 Standard Terms。s attention to the provision(s) whereby such party39。(ii) intentionally concealing a material fact relating to the conclusion of the contract or supplying false information。 Liability for Disclosure or Improper UseA party may not disclose or improperly use any trade secret which it became aware of in the course of negotiating a contract, regardless of whether a contract is formed. If the party disclosed or improperly used such trade secret, thereby causing loss to the other party, it shall be liable for damages. Chapter Three Validity of ContractsArticle 44 Effectiveness of ContractA lawfully formed contract bees effective upon its formation. Where effectiveness of a contract is subject to any procedure such as approval or registration, etc. as required by a relevant law or administrative regulation, such provision applies.Article 45 Conditions Precedent。 Improper Impairment or FacilitationThe parties may prescribe that effectiveness of a contract be subject to certain conditions. A contract subject to a condition precedent bees effective once such condition is satisfied. A contract subject to a condition subsequent is extinguished once such condition is satisfied. Where in order to further its own interests, a party improperly impaired the satisfaction of a condition, the condition is deemed to have been satisfied。(ii) The parties colluded in bad faith, thereby harming the interests of the state, the collective or any third party。(iv) The contract harms public interests。s liability for personal injury caused to the other party。s liability for property loss caused to the other party by its intentional misconduct or gross negligence.Article 54 Contract Subject to Amendment or CancellationEither of the parties may petition the People39。(ii) the contract was grossly unconscionable at the time of its conclusion.If a party induced the other party to enter into a contract against its true intention by fraud or duress, or by taking advantage of the other party39。s Court or an arbitration institution for amendment or cancellation of the contract.Where a party petitions for amendment of the contract, the People39。s cancellation right is extinguished in any of the following circumstances:(i) It fails to exercise the cancellation right within one year, mencing on the date when the party knew or should have known the cause for the cancellation。 Partial Invalidation or CancellationAn invalid or canceled contract is not legally binding ab initio. Where a contract is partially invalid, and the validity of the remaining provisions thereof is not affected as a result, the remaining provisions are nevertheless valid.Article 57 Independence of Dispute Resolution Provisio