Taking natural thermo-potential difference as natural draftpressure 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。
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This paper describes the design of a portable draftpressure tester and analyses its architecture and the working principle of its main module, and also discusses its accuracy.