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螺纹
分，并
顶封住。
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螺纹分，并顶封住。
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，
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