Filler plugs for contact cavity size 20, on request.

可根据需要提供插针尺寸为20的填充插头。

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Product in contact with mouth lip or mouth cavity directly. eg. Toothbrush, drinking straw.

会跟嘴直接接触的产品，例如牙刷，吸管。

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The model tests were carried out on RPC under contact explosion, the coefficient of explosion cavity radius of the material is obtained by above experiments and theory study.

并对钢纤维RPC抗接触爆炸性能进行了初步的模型试验研究，根据试验数据及理论研究得到了它的爆炸压缩半径系数。

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An attempt to make contact with the trapped miners was unsuccessful Friday, when a microphone lowered into a narrow hole drilled into a mine cavity detected no sounds.

CNN: Camera lowered into mine cavity shows 'survivable space'