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.
载有核数师盖章、注册核数师亲笔签字并盖章的财务报告正本。
The original of the Financial Report of the Company under the seal of the Auditors and under the hand of Certified Public Accountants.
如果要求单据“签字并盖章”或类似要求，则单据只要载有签字及签字人的名称，无论该名称是打印、盖章或手写，均满足该项要求。
A requirement for a document to be "signed and stamped", or a similar requirement, is also fulfilled by a signature and the name of the party typed, or stamped, or handwritten, etc.
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