主服务器充当认证机构(Certificate Authority, ca)，并向安全服务器和代理发布x . 509认证。
The primary server ACTS as the certificate Authority (ca) and publishes X.509 certificates to the security servers and the agents. The X.509 certificates are used for authentication.
本机设有断绳保险机构和主保险定位机构及液压锁，保证使用安全，平衡可靠。
This auto lift has breaking rope safety device, main safety location device and hydraulic lock, All these things guarantee safe and stable operation.
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