用瓦斯鑒定器測(cè)定A點(diǎn)CO2時(shí),首先測(cè)得A點(diǎn)CH4為2%,當(dāng)甩掉蘇打石灰吸收管測(cè)定時(shí),鑒定管讀數(shù)為4%,則CO2含量為()
A.2% B.4% C.1.91% D.3.82%