A.1:20:4B.20:1:1C.1:1:20D.1:20:1
A.鹽性物質(zhì)B.酸性物質(zhì)C.酸堿物質(zhì)D.堿性物質(zhì)
A.1:1.5B.1:1.6C.1:1.7D.1:1.8