A.2mm B.0.1mm C.8mm D.10m
A.2s B.3s C.0.5s D.1s
A.非接觸式數(shù)字光電轉(zhuǎn)速表 B.接觸式數(shù)字紅外線轉(zhuǎn)速表 C.非接觸式同步閃光轉(zhuǎn)速表 D.接觸式磁性轉(zhuǎn)速表