短語(yǔ)詞組短語(yǔ)proportional boron -lined counter 正比涂硼計(jì)數(shù)管boron trifluoride proportional counter 三氟化硼正比計(jì)數(shù)管boron deposited proportional counter tube 硼沉積正比計(jì)數(shù)管 返回 proportional boron counter