step attenuator分级: grade; classify; classificat ...衰减器: attenuator; attenuation pad; ...梯级衰减器: stepped attenuator分级可变光衰减器: stepwise variable optical attenuator次级衰减: secondary extinction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:分级衰减器，即可在微信中查询翻译
