Most tachometers measure the speed of rotation of a spinning shaft or wheel in t

游客2023-12-30 48

问题 Most tachometers measure the speed of rotation of a spinning shaft or wheel in terms of revolutions per minute.

选项 A、pumping
B、wavering
C、floating
D、whirling

答案 D

解析 spinning(旋转的)；whirling(与spinning同义)；pumping(抽水的)；wavering(摇摆的)；floating(漂浮的)。

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