Taking natural thermo-potential difference as natural draft pressure is ambiguous in theory and not in accord with the actual condition of mines.
把自然热位差当做自然风压在理论上是模糊的，是不符合矿井实际情况的。
With an increase in the draft or a decrease in the cabin pressure, the natural heave period shows an increasing trend.
随着吃水的加大或分舱内气压的减小，垂荡固有周期值有增大的趋势。
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