Valve is closed twice so that the seal ring can self-center.
关闭阀门两次，使得密封环能够自动校准中心。
The closed-ring system is proved to be steady.
闭环系统被证明是稳定的。
Equipped with a closed transmission slip ring, cable is not wrapped, good electrical conductivity.
配置封闭式输电滑环，电缆线不缠绕，导电良好。
Equipped with a closed transmission slip ring, cable is not wrapped, good electrical conductivity.
配置封闭式输电滑环，电缆线不缠绕，导电良好。
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