In this case you need to know the implementation class because you have to construct an instance of it from the information in the serialized certificate.
在这种情况下，您需要了解实现类，因为您必须从被序列化的证书信息中构建它的实例。
2
Explosion proof and protection class for instrument shall be met according to the requirements of Technical Specification, and relevant quality certificate documents shall be provided.
必须满足技术规格书对仪表防爆及防护等级的要求，并提供相应的质量证明文件。
3
The pilot held a current airline transport pilots licence ( helicopters and gyroplanes ) and a valid class one medical certificate. he had 3, 900 hours of operating experience.