单选题Most tachometers measure the speed of rotation of a spinning shaft or wheel in terms of revolutions per minute.Apumping Bwavering Cfloating Dwhirling
单选题
Most tachometers measure the speed of rotation of a spinning shaft or wheel in terms of revolutions per minute.
A
pumping
B
wavering
C
floating
D
whirling
参考解析
解析：
句意：大多数转速计测量的是一个轴或轮子的旋转速度，按每分钟转动的圈数计算。spinning旋转的。whirling与之同义。pumping抽水的。wavering摇摆的。floating 漂浮的。
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