答：有效，除非约定合同生效需签字并盖章。
Answer: effective, unless the contract agreed to sign and seal.
本合同的修改补充应按双方授权代表签名盖章的文件，才能进行。
This Contract can only be altered, amended or supplemented in accordance with documents signed and sealed by authorized representatives of both parties.
本合同自甲方盖章、乙方签署之日起生效。 。
This contract shall come into effect since both sides sign their names.
第十六条劳动合同由用人单位与劳动者协商一致，并经用人单位与劳动者在劳动合同文本上签字或者盖章生效。
An employment contract shall become effective when the Employer and the Employee have reached a negotiated consensus thereon and each of them has signed or sealed the text of such contract.
本翕合同只能按照双方授权代表签名盖章的文件进行修改或增补；
This Contract can only be altered, amended or supplemented in accordance with documents signed and sealed by authorized representatives of both parties.
由市政厅签署的合同，若其中涉及的金额和数量超过50倍，则须盖章并履行其他手续。
A contract made by an urban council, whereof the value and amount exceed X50, must be under seal, and certain other formalities must be observed.
第十六条膍劳动合同由用人单位与劳动者协商一致，并经用人单位与劳动者在劳动合同文本上签字或者盖章生效。
Where the employing unit and the laborer have reached a consensus after consultation, they may conclude a labor contract where the term of service equals to the period of completion of a certain task.
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.
以示守信，卖方与买方谨签名并盖章于此，接受本合同各项条款，各条款自此生效，并对双方有同等的约束力。
In witness hereof, the Seller and the Buyer affix their respective signature and seal accepting all of the terms and conditions here in which become effective and legally binding hereinafter.
本合同双方签字盖章之后经传真或扫描电邮生效。
This contract will become valid through fax or email or scan copy after signing or stamped between seller and buyer.
本合同于双方签字盖章之日起生效，至原厂提供的质保期结束时终止。
The effective date of this contract shall commence upon the date of signature and seal by parties hereto, which shall terminate on end and conclusion of guarantee period by original manufacturer.
在一个极端，法律要求订立合同必须盖章。
At the one extreme, the law may require the contract to be made under seal.
兹证明，双方委派各自代表，在以上开首语中书明的日期签署盖章。本合同一式两份。
In witness whereof, the Parties hereto have executed this Contract in duplicate by their duly authorized representatives as of the date first above written.
出让方和受让方达成成交意向后，应当签订产权交易合同，并签字、盖章。
The transferor and the transferee, after arriving at the intention to make a deal, shall enter into a contract of property rights transaction, which shall be signed and sealed.
当我们签署了一份文件例如，一个银行的业务合同或文件，签字盖章的同意，协议，认真看待这个问题。
When we sign a paper, for example, a business contract or a bank document, the signature is a seal of consent, an agreement to take the matter seriously.
本合同一式三份，经三方签字盖章后，具有同等法律效力。
This contract made in 3 (three) copies and has the same law intensity and signed by both parties at the top of stamps.
作为本合同的证据，甲、乙双方签名盖章生效。本合同一式两份，甲乙双方各保留一份。
This Contract shall be effective with both Parties' signatures and seals attached hereunder. This Contract is in duplicate, Party A and Party B shall hold one each.
本合同经双方签字盖章后生效。
The Contract shall come into force after signatures by both parties.
结算以乙方工作人员签名或盖章的“送货签收单”为依据，“送货签收单”视为本合同的附件。
The balance should be paid by the delivery note with working staff's signature and seal, and this delivery note is also regarded as an attachment to the contact.
买卖双方把正式签字盖章的合同文本各自存入自己的银行。
After signing, both parties lodge the contracts with their respective Banks.
此合同一式两份，买卖双方各持一份，此合同在买卖双方签字盖章后生效。
This contract is made in two originals, one for each party. It shall come into the legal effect after being signed and sealed.
第十六条劳动合同由用人单位与劳动者协商一致，并经用人单位与劳动者在劳动合同文本上签字或者盖章生效。
Article 16. A labor contract shall become effective when the Unit and the laborer have reached a negotiated consensus thereon and each of them has signed or sealed the text of such contract.
合同盖章与否不仅影响合同成立，也将直接影响合同的效力。
To imprint or not leads to whether the contracts are made and is directly related to their potency.
本合同如存在未尽事宜，甲乙双方可以用书面补充方式解决，本合同签字盖章后有效。
All other issues can be resolved by written ammendments to this agreement by both parties. The agreement will be effective on signing and stamping by both parties.
企业董事长签署的关于因股东名称变更而修改章程（合同）的申请报告原件1份（打印，申请企业盖章）；
One original of the application of constitution (contact) amendment because of shareholder change signed by the chairman of the board (printed, sealed by the applicant);
协助商务部各项目组的销售合同、采购合同制作完成，并负责联络合同的签字和盖章各项事务。
Assist the ministry of commerce service groups related data sorted, screening, input SAP, which Information system, and help the project team of the data needed for export and finishing.
第三十五条当事人采用合同书形式订立合同的，双方当事人签字或者盖章的地点为合同成立的地点。
Article 35 If the parties adopt the form of a contract instrument to make a contract, the place where both parties sign or stamp the contract is the place of execution of the contract.
第三十五条当事人采用合同书形式订立合同的，双方当事人签字或者盖章的地点为合同成立的地点。
Article 35 If the parties adopt the form of a contract instrument to make a contract, the place where both parties sign or stamp the contract is the place of execution of the contract.
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