With certain shapes of or canula, elongated caps are made to cover both canula and threaded portion, and seal the canula at its top.
根据口和导
不同形状,可以制造细
盖以覆盖导
和螺纹部
,并
顶部封住导
。
With certain shapes of or canula, elongated caps are made to cover both canula and threaded portion, and seal the canula at its top.
根据口和导
不同形状,可以制造细
盖以覆盖导
和螺纹部
,并
顶部封住导
。
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