A.180℃ B.185℃ C.190℃ D.195℃
A.0.5% B.1.0% C.0.8% D.0.2%
A.1.8-11.8,C4H8O B.4.1-74.1,CH2OH C.2.8-62.8,C4H8O D.4.1-74.1,CH3CH2COCH3