• Measure of the effective optical path of QN-1total flow extinction type smoke meter developed recently is described in detail.

    对近期所研制QN - 1型全消光烟度有效测定进行了较为详细的叙述。

    youdao

  • Measure of the effective optical path of QN-1total flow extinction type smoke meter developed recently is described in detail.

    对近期所研制QN - 1型全消光烟度有效测定进行了较为详细的叙述。

    youdao

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