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| 单词 | hook gage |
| 释义 | hook gagenoun : an instrument for measuring the rise or drop in elevation of a liquid (as water in a reservoir) from a previously recorded level by means of a pointed hook that is directly connected to a fixed part containing a scale (as a vernier) and is submerged and moved gradually until its point just pierces the surface of the liquid from beneath when the measurement is taken |
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