unit holders 单位持有人 ; 信托单位持有人
The unit provides power for a variety of access control hardware devices including magnetic locks, electric strikes, and magnetic door holders.
该控制器可向很多反问控制设备供电，包括磁性锁具，电击和磁性门扣。
Supplied with a full range of auxiliary weights, specimen holders, abrasive wheels, wheel refacer and vacuum unit.
配有全套辅助砝码，试样夹，磨擦轮，真空装置，膜式控制键盘及电子计数器。
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