1、
Ventilation resistance and ventilation isobar in the workings were measured with barometer.
采用气压计混合读数法测定了综放采场区域的通风阻力及通风等势图.
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2、
The design of spring is the critical factor to the feature of isobar filling valve.
弹簧设计对于等压灌装阀的性能起着决定性的作用.
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