| 摘要 |
<p>A pipette, comprising: a cylinder (1) with liquid passage (3), a plunger (4), and a plunger operating means (5) for moving the plunger in the cylinder; said operating means comprising a body (6), a threaded rod (7), an operating member (8) cooperating by mediation of threads with said threaded rod, and a power means (9) for rotating the threaded rod and the operating member relative to each other for moving the plunger by mediation of the threaded rod and the operating member when the threaded rod and the operating member are rotated relative to each other with the aid of the power means; the thread of the threaded rod (7) or alternatively that of the operating member (8) being non-linear locally over a certain transition range.</p> |
