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