题目内容
(请给出正确答案)
提问人:网友kyhdmmyt2
发布时间:2022-01-06
[主观题]
Modern handheld digital tachometers operated by counting light pulses returned to the unit
by
A.the tach generator
B.either the coupling or shaft
C.a small bulb attached to the shaft
D.a piece of reflective tape
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