By regarding testing mechanics behaviors of frozen soil frost heave as the research background, a hydraulic force control system was designed on the basis of valve control asymmetric cylinder.
以测试冻土冻胀的力学行为为研究背景，设计了一套基于阀控非对称缸的液压力控制系统。
2
Prevent and cure a frostbite, the valve key lies in common reinforce campaign and completes personal frost proof and keep warm performance.
防治冻疮，关键在于平常加强运动，做好个人防冻、保暖措施。
3
The frost proof faucet comprises a valve, a water pipe and a frost-preventive switch.