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