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
的不同形状，可以制造细长的盖以覆盖
纹部分，并
顶部封住。
With certain shapes of or canula, elongated caps are made to cover both canula and threaded portion, and seal the canula at its top.
根据口的不同形状，可以制造细长的盖以覆盖纹部分，并顶部封住。
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