This class has to be sealed since the build engine instantiates its own copy of this type.
由于生成引擎会实例化自己的这种副本，因此必须密封此类。
Bidder should provide the printed version of various valid qualification certificates, such as business license and operation license, etc (The copy must be signed or sealed by the bidder).
投标人须提供各种（合格有效的）资质证书的复印件：如营业执照、经营许可证等；
Above all information with A4 print copy, with a black pen, signed and sealed is clear and complete.
以上材料一式一份盖公章， 用A4纸打印复印，用黑色水笔签字，盖章需清晰完整。
应用推荐