| 摘要 |
<p>In its raised position, a cap (3) enables air blown in through a cannula (6) to fill the inner space of a tube (1) until an indicator (11, 12 or 13) shows that the volume is sufficient. The cannula (6) is pulled out by the user so that a plug (7) engages a neck (3c) and seals the inlet of a duct (10). The cap (3) is then tightly screwed on to seal the air sample within the tube (1).</p> |
