Therefore, when the upper cover needs to be lifted, operators can lift the upper cover very conveniently by standing at any position around the vacuum lock.
因此，当需要提起上盖时，操作者站在真空锁周围任一位置时提起上盖都非常方便。
The liner programming technology intensive, beware of drilling pile vacuum filling, double lock temperature.
精深的内胆规划技术，谨防钻绒真空填充，加倍锁温。
The liner programming technology intensive, beware of drilling pile vacuum filling, double lock temperature.
精深的内胆规划技术，谨防钻绒真空填充，加倍锁温。
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