| 摘要 |
A closure device for fermentation test tubes or flasks comprises a cylindrical cap which fits snugly over the mouth and neck of a test tube or flask to maintain the sterility of the tube or flask contents while permitting the free flow of gases into and out of the tube or flask. An aperture in the end cap of the closure device permits free access to the tube or flask contents for sampling and is closed by a moveable aperture cover.
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