With certain shapes of or canula, elongated caps are made to cover both canula and threaded portion, and seal the canula at its top.
根据管口和导管的
同形状，可以制造细长的管盖以覆盖导管和螺纹部分，并
顶部封住导管。
With certain shapes of or canula, elongated caps are made to cover both canula and threaded portion, and seal the canula at its top.
根据管口和导管的同形状，可以制造细长的管盖以覆盖导管和螺纹部分，并顶部封住导管。
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