换向时间影响换向盲区的煤气损失量；
Reversal time affects gas losing in the blind zone of the reversal process.
阐述了减少检测盲区的途径及检测探头的模块化设计。
Approach of reducing blind area and designing of modularity is explained.
给出了系统有效视场的判据，提出了绝对盲区的定义和判据。
We define the absolute unmeasurable areaand present the criterion of it.
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