从理论上分析了密度锁在核反应堆非能动安全中的作用及特点，介绍了密度锁的工作原理和结构形式。
The action, work principle and characteristics of density locks used in nuclear reactor passive safety are analyzed theoretically.
对安装有密度锁的反应堆冷却剂系统进行了流动分析，根据流体运动方程和系统的循环流动特性，说明了密度锁的作用和具有的特性。
Based on the motion equation and flow circulation in the system, the flow analysis to reactor coolant system with density locks is given; the action and characteristics of density locks are explained.
结论带锁髓内钉治疗股骨骨折不良反应少，术后恢复较快，值得临床推广应用。
Conclusion in the treatment of femoral fractures by the way of interlocking intramedullary nailing had fewer adverse reactions and faster postoperative recovery. It is worthy of clinical application.
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