radioactive tachometer放射性: radioactivity; activity; emi ...旋: whirl速: fast; rapid; quick; speedy计: count; compute; calculate; n ...频闪观测器式旋速计: stroboscope type tachometer下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:放射性旋速计，即可在微信中查询翻译
