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

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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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