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The technical measures and structure,applied principles of blastproof of ventilation shaft at excavating face,specific operational method and prospective effect are described.

介绍了掘进工作面防炮崩风筒技术措施技术结构、理、采这项技术具体操作方法达到预期效果。

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gas constant, gas cooker, gas engine, gas field, gas fitter, gas fitting, gas furnace, gas gangrene, gas gauge, gas guzzler,

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3G, 401(K), a,

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I could think of nothing but these ventilation shafts.

想到这些气调节筒,却想不出什么别的东西。

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And a ventilation shaft that clears the air can become the center of mysteries and conspiracies.

而净化气的通风井也可成为神秘和阴谋的中心。

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I figured it was a safety measure to prevent curious urbanites from accidentally electrocuting themselves or falling down a ventilation shaft.

认为这安全措施,可以防止好奇的城市居民意外触电或从通风井坠落。

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gasabsorbent, gasahol, gasateria, gasbag, gas-bag, gasblock, gasboat, gasbomb, gas-bomb, gasbooster,

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3G, 401(K), a,
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