躼本意向书自甲乙双方代表签字盖章之日起生效，有效期一年。
This letter of intent is effected after signed by both parties, and valid within one year.
本合同自甲、乙双方签字或盖章之日起生效，涂改或未经书面授权代签无效。
XIII. The contract shall go into force after the signature of both parties. Alteration or signature without written authorization is invalid.
本协议自双方授权代表签字盖章之日起生效。
The validity of this agreement start from the date when the represent signature and step.
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