单项选择题
A.水:生石灰:火碱=85:15:5B.水:生石灰:火碱=100:20:5C.水:生石灰:火碱=20:80:5D.水:生石灰:火碱=5:20:100
A.65℃,20minB.65℃,30minC.55℃,20minD.55℃,30min
A.0-1B.1-2C.2-5D.2-10