Conclusion of Contract. 2.1. Offers made by Supplier are non-binding and subject to amendment. Orders placed by Customer which do not indicate an acceptance deadline shall be binding upon Customer for at least 30 days.
2.2 仅当供货商提交书面订单确认函或对订购的书面确认（“订单确认函”）后，与供货商之间的合同才成立。
Conclusion of Contract. 4.1. A contract shall come into being through an order by PERI accepting a written offer from the Supplier.
4.2. If an order from PERI has not been received by the Supplier within the period in which the Supplier's offer to PERI remains binding (i.e. it is late), the Supplier must notify late receipt of the order from PERI to PERI immediately following receipt of the order declaration from PERI. Only if the Supplier has previously notified PERI of the receipt of the order from PERI, the Supplier shall not be under a duty to submit the immediate declaration of receipt pursuant to the above sentence. If the Supplier delays timely notification within the meaning of this clause, then the order from PERI shall be deemed not to be late.