表外膜 ectexine; ectoexine; ektexine; supersurface film
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tube ektexine 钢管外壁
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exosporium , theca
The heat exchanged by nature convection between cylinder ektexine and air was equivalent to that from the holes on plastic cylinder.
筒外壁与温室空气间的自然对流换热量和塑料筒放热孔与室内空气的换热量相当。
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