Are stored container doors secured with a high security locking device or seal?
企业中存放的集装箱是否装有高安全性锁闭装置或封条？
Job security: electric jack has lift the self-locking protection device that, when beyond top heave range will automatically stop lifting, safe and reliable.
工作安全：电动千斤顶具有升降自锁的保护装置，当超出顶举范围时将自动停止升降，安全可靠。
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