A.3A分子篩和活性鋁 B.氧化銅與3分子篩 C.3分子篩
A.0.1~0.3 B.3~5 C.0.4~0.6
A.質(zhì)量流量計(jì) B.轉(zhuǎn)干流量計(jì) C.孔板流量計(jì)